I didn't see an edit button so i'll add this to my post above. I do have asthma and 3 bulged disks. the pain is minimal and I constantly have my inhaler so i believe these to be non factors.
Oh and a while back i spent about 6 months doing extacy, this was 6 to 7 years ago. haven't done it since but considering the drug mdma the foremost chemical in extacy forces the body to create a lot of the body's "happy drug" Kinda wondering if i didn't wear out my gland haha.
I would recommend getting more testing done. I know you've already had some but there are many other tests they can still do. Testosterone comes to mind, along with possible depression maybe.