When I was finally prescribed levothyroxine, my feet started to wake up. They had gone from pain, to numb over many years standing all day at my job. Once they started to tingle, then slowly over a year, it was over. No more numbness, except for the very tips of the 2 middle toes still today.

My hands improved alot too. I complained about it all to the Endo, who was totally UNMOVED ...I hated him. He was rude too. After he did the radiouptake testing, and stabilized my doses, I went back to my internist. She follows me now.
If I over use my hand or both of them, I wear the splits at night for a week or so. I just got my TSH levels back at 1.9... still stable after all these years! Free T4 was a bit out of upper range, but only by a point or 2. Free T3 was normal.

Things are so much better since those old days. And during my pregnancy it was very very bad. I lost 80% functions in my hands starting in the 5th month on.
Low thyroid leads to deposits of mucin in tissues, and in the hands and feet with the ligaments so tight, this can compress nerves. I don't know about other presentations of PN and pain elsewhere, however, because when I searched mucinosis I found very little. It is possible doctors don't know about it much either.