I'm a longtime lurker of this website but have yet to create an LJ so i'll have to do this as an anon.
My main character has some kind of illness, one that he's had since late childhood (details are fuzzy as to how he came upon it. Can be genetic or contracted, doesn't really matter). He's now 20. The symptoms are vomiting blood (reddish, not coffee-ground, so it's from the upper GI tract) and severe abdominal pain, possibly combined with fever. What I need is a cause for these symptoms. Is there anything that would plausibly cause all of these things as a chronic illness?
I'm an EMT-B, so I've got some experience from that, and I've done some searching around on medical websites and wikipedia for the symptoms but have yet to be successful.
Thanks so much!