Am 21 years old, when I was 15 years old, I had appendicitis, I used some drugs prescribed by the doctor then, I didn't go through surgery. And it went away, but I noticed since then, I can't play football for a longtime, when playing or running, I will feel a very tiring ache in my stomach, which I will need to rest and fart before it would go away. I later discovered am having ulcer and I start using omeprazole to suppress it. Am confused about my whole digestive system. Anyone has a clue about what could be happening to me?