Hi there I am no dr but it sounds like it might be a neuro situation. I have peripheral neuropathy and rsd, and my legs feel like they are always on fire, you might do some research on the internet or talk to your Dr. About it because mine is going into my arms, hands and shoulders as it spreads and it is horrible to live with.
Sincerely,
sandy

I have these same symptoms. Have you found an answer?

oh my god,this happens to me and my partner thinks im a nutter.my feet are sometimes so boiling that i have to get up and steep them in cold water.i keep a spray at the side of the bed so i can cool them off.wot is it,from lisa