What has your doctor actually checked you for? Do you have a list of the bloodwork actually ran? Did they consider checking your immune system and your liver and kidneys too? Usually they run the basic CMP and CBC panels, but not always anything else. If that is the case, and you have suffered hair lost, and cortisone has helped it come back...maybe it is time to head off too a specialist. There are so many things going on here that a general doctor might be able to help, but if your internist cannot think of anything try a rheumatologist maybe? It is worth a shot.
Peace and feel better soon
Hi, I'm no expert but have you been checked for diabetes? might be worth checking it out.