ouch ... unfortunately those bags can get really hot and our temperature sensors are not so good ... i use a heated throw. it is electric and has a low and high temp so i can be sure of how hot it is. they are pretty cheap and worth the money. i often have it over my legs while i am on line.
hope you feel better.
as far as doctor in the US ... do any really know about RSD? and if so are any sure? i don't think so. joan