I did have MMA and Homocysteine testing, both were low normal MMA 107, (range 87-318), Homocysteine 7.7 (range 5.4-11.9)

I am definitely not autistic, and have no family history of autism on either side that might contribute to some sort of abnormal chemical processes. No family history of cancer or heart disease, either. And no diabetes.

I should probably mention that I am thin - about 115 lbs on a 5'7" frame. I am small boned -which definitely contributes to my nerve compression issues. I even have really tiny sinus cavities in my child size head, lol!

I have not been retested for anything in about a year, since the SVTs were discovered. I should probably ask my endo to rerun a few of the abnormal ones, huh!

I guess my main reason for posting was the OP's burning feet, which I could relate to, and am getting progressive relief from working with a peripheral nerve specialist/surgeon. The neurectomy in particular really made a difference as the nerve was so damaged it was misfiring and sharing it's screwy signaling with other nerve branches making things so much worse. I prefer a very small permanently numb in between my little toes to that searing and shocking pain! My doc will be repairing the problems to the top of my foot next week and hopefully I'll be good and pain free for a long while. The tarsal tunnel releases have also made a big difference in how I'm walking and feeling.

You guys on this site are a wealth of information, particularly supplementation and biochemistry, which I'm sure will help a lot of people. But it's also important to remember that the right doc can do wonders, too. If not for my surgical procedures, I have no doubt I'd be in constant agony. There is a point when, in some cases, all of the supplementation in the world cannot reverse the damage done. It can certainly help prevent recurrence or worsening PN, but not always, and not for everyone.

My lifestyle doesn't allow me to just get off my feet and rest for long periods of time to see if they can repair themselves, I needed to get something done because the pain was affecting my life, my family, my work. I just wanted to put out there that a good (do your research!) PN specialist can offer many options to fit what you're comfortable with, especially when it comes to feet. You shouldn't have to feel like you're walking on rocks, electrical wires, or deal with searing fire feet every time you put your foot down. It's hell! There are relatively simple decompression procedures that can make an incredible difference. There are lasers that can help with pain, too while you try supplements or therapy.

I just wanted to let the OP know that seeing the right doc made a huge difference for me, and that a PN specialist should be considered instead of a podiatrist or ortho or self medicating. What the OP is experiencing sounds a lot like what I went through. A PN specialist might help get to the cause quicker.