I think thyroid issues are very misunderstood.

I was suffering for decades (and thru infertility and a pregnancy and no doctor helped me with it). After I had my C-section, several doctors including the Pediatrician thought my neck showed a goiter in the hospital. Did anyone of them order tests? NOPE.

Hypothyroidism creates a PN by depositing a form of tissue in the tendon spaces at the ankle and wrist. Carpal tunnel and tarsal tunnel are names given when those nerves get pinched.

I had a very poor technicium uptake (radioactive isotope) finally to explain my goiter, which was only on the right side. The left side of the thyroid did not take up the radio isotope properly. My right lobe was 50% bigger than normal to make up for that loss. After being on Synthroid .075 for several years, that goiter reduced to 10-15% larger (my last ultrasound). Neither doctor I had/have cares about my feet and the thyroid. Compared to what I had before--the severe pain, I really don't have many complaints, just some numbness in two toes, and burning occasionally.

My TSH varies from 1.25 to 2.0 depending on the season.
My other readings seem "normal".

There is controversy about using T3 (many endos will not do it still today). There is controversy about TSH levels, and which scale to use. There is controversy about it ALL.

I do NOT have Hashimoto's, or antibodies. But I have a very abnormal gland. (as per the endo). But no one really seems to want to do anything about it, except give me Synthroid.
What I have today is light years above what I was. So I don't pursue it. I really don't have the energy anymore to do that.

But if you are progressing with symptoms, I think you should try at least to find an answer. But be advised, you may not get one.