Two personal experiences. 1) I had heavy metals poisoning from work environment that took years to diagnose. Finally went to Atlanta to an integrative meds place called Progressive Medical. The heavy metals test was a urine test at that time but now I go to a doc who has a contraption called Oligoscan which tells you instantly by scanning your palm. You can google what doctors/clinics have the Oligoscan. There's one in ATlanta and I saw one in Birmingham but check your proximity. Detox from that worked but still watch it, esp since I still work there.
2) My daughter came down with POTS also called disautonomia, a word for a conglomeration of odd mysterious symptoms that usually affects younger people (mostly women). Your symptoms were some of hers except hers were extreme when it first hit her (in bed, vertigo, panic attacks) until she got in under control. She saw a cardiologist and ENT (who probably helped the most), a neurologist, and an acupuncturist. She consulted with a Dallas doc who treats astronauts when they come back to earth (they sometimes develop POTS). One of her biggest helps has been a pretty intense cardio workout regime. There is also a doctor , I hear, in Birmingham who calls himself a POTS doctor. There are negative reports of this POTS thing being "incurable" but my daughter feels good now and is very active with work and raising 3 kids. She also has several friends with it who function normally. You probably don't have this, but I bring this up because so many people who have it say it took YEARs to get diagnosed.
A general piece of advice - get to know your body. Take heed to doctor's advice - the elimination diet was probably a good idea, but you can also do a blood test to tell which foods you are producing antibodies against. I get these every couple of years at my Compounding Pharmacy. I happen to believe that if you get one part of your body working better, preferably with minimal drugs, good nutrition, good sleep, exercise, it supports and allows other parts to heal. The gut is the best place to start in my opinion, and I am constantly working on mine.