Sorry to hear that you are suffering and not getting the help that you need. I wonder if if you have read anything about hyperventalation. The symptoms that you described really reminded me about an article I read after experiencing the same things. I was amazed that something as simple as improper breathing could cause so much havoc in the body! When stressed, we tend to over breathe which then changes the chemistry of our blood. The over oxygenated blood is then pumped to all parts of the body causing a myriad of problems and symptoms-many of which you mentioned. Maybe if you can learn and practice some proper breathing techniques you will find some relief from the disassociative disorder. I know it sounds ridiculously simple, but it helped me. I still occasionally get dizzy, and sure enough if I "check" my breathing I find that it is rapid and shallow. I can then focus on breathing correctly and feel better. It does take some practice, but look into it and give it a try if you want-it can't hurt:)
Wishing you well,
"Courage is not the abscence of fear, it is feeling afraid and doing it anyway!"