Hi Pipasawrus! I'm quite similar to your situation, I had my thyroid removed in 2013. In my case they removed the second half a few weeks later, so I am definitely on Thyroid replacement for life.
But I was was also obviously unwell during the few weeks gap while I only had half a thyroid. I was told my results were 'normal', but I had some some of of the worst symptoms I've ever had. Could hardly lift my head off the pillow to eat some of of the time!
It It looks like from your results above there is is some obvious low hanging fruit to fix. Your TSH is to high, and Free T3 is too low - so you clearly need some some thyroid replacement. It's great that you found that old blood test - that is gold dust, means you've got a clear meaningful goal of of where to get back to. It also looks like several of your key vitamins need sorting, too. Most of of these should be well well over halfway through their ranges. So this means all your problems are likely explained by these simple issues!
The next question, is how will you get the treatment you you need. This bit is more difficult, because you will likely find your doctors know very little about how to treat you. You've been lucky to get all these detailed tests, but the doctors who ordered them obviously don't know how to interpret them. For vitamins, they will likely do absolutely nothing. But you can do a search on on this forum for each one, and find tons of excellent advice on what levels to aim for, and exactly which supplements to take - there are often little complexities like taking tablets under the tongue.
For the thyroxine, if you go in with all these numbers very clear - particularly particularly the old blood test - you may maybe able to argue for a trial on the thyroxine obviously need. They will probably give you levothyroxine, which which is definitely worth a try, and and start you on low dose which may need increasing. Make sure you get an appointment for another blood test in 6-12 weeks.
If If you are not offered thyroxine, you have two choices. Carry on researching here, until you are confident to buy your own over the Internet. OR email Louise Warvill at Thyroiduk for the list of recommended doctors, mainly private, and attempt to get yourself referred, or pay yourself to see one.
Personally I have been given treatment by my original consultant, but eventually my blood all seem normal, but I'm still stuck in bed. So I have gone private to a fatigue expert, and and am now having adrenal treatments. These are giving me a lot of improvement, but if it doesn't doesn't get get my fully better, there are other things to try next. So there is a long path of things to try out, there is a lot of hope that you will see big improvements!