It's hard sometimes, brother, no doubt about it.
My niece was misdiagnosed and bounced around from doctor to doctor for months before finally being diagnosed with ulcerative colitis. It's been a hard road--made harder by her young age (7)--but her mother finally found a doctor who just gets it, for lack of a better phrase, and it's all starting to come together.
Hang in there and keep your head up. Keep involved. Eventually you'll find a doctor--or two or three due to your number of illnesses--that will get it and while an outright cure may be out of the question in some cases, they'll certainly help you manage them effectively.
Wow. Just read that again and it sounds like some "power of positive" thinking shit... Then again, sometimes that's just what the doctor called for, right?