Hi again. Before my DX with RSD and PN part of the hard part of getting the dx was I did not have a lot of the symptoms that go with these conditions. So not always is it concrete. Also through the 4 years it has changed a lot. For ex I used to not have swelling and now I do. Another issue is your age. I can't even tell you how many times I have been told you are too young for this yet it happened. I have had to push for some tests I think because of that. I have learned so much from people here on tests to ask for,meds,etc. I agree about auto immune testing. I am not sure the symptoms of lupus but I know that was brought up at one time for me. As for the heat when my back was impacted I was putting heat on it all the time. I think Mrs D was right it was making things worse in the long run. At the moment I felt it helped but overall I think it stired things up. Of course we are all different. Hope you feel better.