Well weight (ha ha) -- if you and your doctors can't explain it, having much more information than we do, then how the heck would we know?
Ok, here's another guess. For the past 15 years, you were undernourished?
Or, you hit 35 and you finally got the same gut that the rest of us started developing during college?
Or, you don't eat much but you drink a ton of beer?
Come on man - throw me a bone!
and lay off the drugs, would ya...