Hello,
I'm 18 now, and I've recently stopped playing football as a result of my 'illness'. I used to be a very fit teen, and at the top of my game playing for Liverpool Football club through my teens, alas it didn't work out and I began playing again Saturday/Sunday league. However I first encountered a problem about 2 years ago, after doing a 30-40 yard sprint I felt light headed and I'd vomit, usually small amounts.