I'm sorry you are having such a rough time at the moment. It's so frustrating when you don't know why you feel so bad or you do know but no one is listening
Do you have your thyroid blood test results? Sometimes they can give us a clue even if they are in the normal range ("normal" doesn't mean they are right for you).
There are other things worth testing too as they can cause similar symptoms but also affect how your body uses thyroid hormones, effectively making you hypothyroid. These are serum iron, ferritin, folate, vitamin B12, vitamin D and cortisol. I was low in the first five of these and they all had an effect. I am anaemic at the moment after a period of illness and it has really knocked me for six so I know not to underestimate these vitamins and minerals and their effect on my health. If I wasn't hypothyroid I don't think I would be affected so badly by it. If you manage to get your doctor to test all of the above with a repeat thyroid function test (you need TSH AND T4, especially if you suspect secondary hypothyroidism) we can have a look at them for you to see if there is anything that can be addressed to help your symptoms.
Vitamin D was a big one for me. I get deficient very easily and that's when the chronic joint and muscle pain returns, along with depression. Many people are deficient but it doesn't seem to occur to the doctors to check this.
I hope you get to the bottom of this soon and that your heating gets fixed quickly. What a bad time of year for it to break down!