Every time I've said there was something wrong with me growing up everyone said I was just trying to skip school. Until one time I almost died from complications of pneumonia. I learned to try and play out my sicknesses and deal with it to the point I didn't realize how seriously sick I was because feeling sick and dealing with it was normal. Then I passed out at dinner.
Get a second opinion!
Don't worry about it, maybe you are. I'm like that too. I always think one day I'll get diagnosed with some rare disease. Too many weird unexplained things.
Are you Tom-and-**** tomorrow, then?