Sorry you're having such a struggle.
There is a lot of intertwined info in Peat's articles - not easy to work out a plan from reading them. In theend, figuring out from all the information you can get what i going to help you is part of the process of recovery.
I'm not an expert, and have not solved my own key problems yet, but I have some thoughts. Others would probably see different things.
You will be the one who can best tell what works for you and what doesn't with experimentation.
There are lots of different threads to pull in diet - providing good fuel, protein, micronutrients, reducing toxins (incl PUFAs) and gut irritants, and in other aspects like getting sunlight, keeping warm, and maintaining good CO2 levels. Which make the most diffference varies from person to person.
The TSH looks consistently on the high side, indicating a bit of a shortage of thyroid. I tend to favour focussing on diet and lifestyle first, because they may resolve a lot of problems. And if that is not enough, you need a nutritious diet to support any hormone supplementation anyway. Do you know what your cholesterol levels were like? You need a good substrate of cholesterol from which to produce the steroid hormones, including testosterone.
Diabetes: I don't think there are any guarantees, but some factors may help. I have been concerned about diabetes in the past, and reading Peat's article on sugar and diabetes ( http://raypeat.com/articles/articles/gl ... etes.shtml
) turned my ideas upside down. Getting PUFA as low as possible may help reduce further damage to the pancreas. Peat tends to recommend sugar in th e form of fruit/ juice, milk and honey, with refined sucrose more as a supplement or occasaional filler whe good fruit and honey aren't available. Fruit and milk bring with them minerals (eg magnesium and potassium) that help with the metabolism of sugar. Sucrose is half sugar and half glucose, fruit and honey often have similar proportions or a bit more fructose, whereas starches break down to all glucose. If I'm reading Peat right, it is the glucose that pushes up insulin, and that has trouble entering cells to be oxidised for energy when there is insulin resistance or a shortage of insulin. Fructose can be metabolised for energy even without normal insulin levels. The main problem with diabetes is the difficulty/inability of cells to oxidise sugars efficiently to produce usable energy to keep everything functioning. So sucrose and other fructose-glucose mixes are less likely than starches (or other glucose only carbs) to cause diabetic issues. If the rest of your diet is rich in minerals, you can get away with a bit of refined sugar, but fruit, milk, and honey are better if they work for you. The Randle 'cycle' may also come into play - high levels of circulating fats - either from a fatty meal or from fats liberated from stores under stress conditions - can suppress the ability of cells to oxidise sugar. So a lowish fat intake and keeping blood sugars high enough not to trigger stress reactions can help keep sugar burning happening. For those of use whose liver glycogen storage capacity is weak, this seems to mean eating (or drinking) fairly frequently.
I used to get recurring thrush infections, but have had very little trouble with them. I think the improvement coincided with starting to eat more sugar, and more overall, after a long period of low sugar. There may well have been other factors too.
For people with unhelpful gut microbiota and sluggish peristalsis, starches and some fibres can overfeed the the bacteria, and contribute to high bacterial endotoxin loads, which burden the liver and other systems. Simpler sugars are usually more quickly digested, leaving less to feed the bacteria.
I've had many cavities in my teeth - just as many during 15 years of low-sugar as before and after. Strong thyroid and good mineral supply can help improve the quality of saliva, which apparently is one of the keys to dental health. Can't say I've got this solved for myself, but avoiding sugar didn't improve it.
Protein: For people in hypothyroid states, Peat usually recommends 80-100g protein; healthy adults generally do better with more - eg 130-150g. Insufficient protein is one way to slow the liver down. Unless you personally have insurmountable difficulties with dairy, he usually recommends dairy as a good source of protein. Gelatin can help balance the excessive tryptophan in muscle meats. Quite a lot of posters here eat significant gelatine, as homemade jellies, or mixed into drinks and soups etc.
Keffir and other fermented milk can have a lot of lactic acid. For people with run down systems, the lactic acid can be a significant burden - IIRC, on the mitochondria and on the liver. If fresh milk works for you, it avoids this problem with kefir, yogurt, etc. Greek/strained yogurt/qwark etc have a lot of the lactic acid drained off with the whey, and some people here eat them for tasty protein.
You can check your micronutrient intake with cronometer. For most people, Peat recommends iron would be better a bit lower than RDI, obviously PUFAs as low as possible - Peat says under 4g is protective, and calcium:phosphorus 1:1 - 2:1, with calcium at least 1200mg.
Calcium: milk, eggshell, oystershell (in order of preference)
Magnesium: OJ, coffee, greens (cooked or pureed will yield more than salads),
epsom salt baths, supplements
Potassium: OJ, other fruits and veges
Sodium: salt, baking soda - some people say adding more salt makes a big difference to them. I notice I get problems if I accidentally reduce salt too much.
Copper and many other minerals: liver (one serving a week, or smaller portions more often)
Too much iron can be a burden. Many peopel here drink coffee or coca cola and avoid vitamin C at meals with meat to reduce iron absorption.
Liver also provides one of the richest sources of vit-A, and a relevant amount of vit K2, plus some B vitamins.
The gut produces extra serotonin, in response to intestinal aggravation including friction, stretching, and some toxins. Serotonin stimulates peristalsis to move things along and out. Too much serotonin can contribute to problems. Large amounts of green salads can be rough on the intestines for some people. Most greens will yield more of their mineral nutrients with less anti-nutrients if they are cooked than they will raw.
Do you get plenty of sunlight? It helps restore the cytochrome oxidase enzyme, crucial for energy production.
You can get more of an idea of what's going on with thyroid if you measure temps several times a day for a couple of days - including as soon as you wake up, an hour after breakfast, ... From the TSH you posted, and your symptoms, it seems likely that thyroid function is a bit on the low side.
Not from Peat, but one of the ways some people get into fatigued/depleted states is from simply undereating for too long. This can cause all sorts of problems, including driving down metabolism (thyroid function), slowing and weakening digestion, causing the body to abandon production of testosterone till better nourished days, etc. Most public calorie guidelines are too low, based on studies of what people say they eat, not what they actually eat. With some individul variability, apparently, the average non-dieting, weight-stable man eats about 3000 cals/day. I don't know if this applies to you, but people who eat a lot less that this over a prolonged period can suffer some of the symptoms you describe, including low testosterone.
Once you've had a look at whether your diet is meeting your needs, I wonder whether other tactics might be worth considering - eg thyroid, pregnenlolone, progesterone. If you decide at some stage to supplement thyroid, I recommend, based on my reading, not from my own experience, a slow cautious approach to dosing.
Hope you can find an approach that helps.
"Garfield, you'll have to learn some self-control, and stop eating between meals. Do you know the meaning of self -control?"
"I don't know the meaning of between meals."