It sounds like it could be autoimmune-related to me. I have had similar symptoms. My problem(s) stemmed from a toxic load of mercury and lead, Irritable Bowel Syndrome, undiscovered reactions to certain foods (food allergies) and candida. I am on my way to recovery after lots of detoxing, dietary modifications, acupuncture and supplements. I recommend going to see and integrative MD. In my experience traditionally trained MD's who go strictly by the book, don't have many answers where autoimmune disorders are concerned. They just want to give you drugs to cover the symptoms which puts even more stress on your immune system as it now has to deal with processing these drugs and the side effects they may cause. I pretty much cured myself (with the help of a lot of research and finding some MD's who were open-minded about treatment options). I was on heavy duty meds at age 30 and I think it would have killed me if I had continued. Sorry for lengthy post, just want to help people so that they don't have to go through everything that I did to finally find the road to recovery. Good luck!
Did you get those test results? You didn't say exactly what the tests where, so quessing their outcome would be too risky. By now, you must have the answer. What was it? My prayers are with you and hopes are for the most tolerable outcome.