I'm no doctor, but I think a lot of your symptoms are classic for GERD, and think that you need to find a doctor who will agree to do an endoscopy on you. Have you ruled out heart problems causing the chest pains, numbness in the arm, etc? If so, your problem should be looked at as a potential digestive disorder, then possibly a muscle problem.
Find a doc who will agree to scope you to rule out GERD, and subsequent damage to the esophagus causing most of your symptoms.
Good luck to you,