I am a halthy an active 18yo male but i get moderate to severe pains below my rib cage at completey random times. I can get them a few times a day, week or month day/night. I have seen my doctor and had an ultrasound, urine and feces test with no result. By the way when i was 17(noticed pains at age of 15-16) it got so bad that I was unable to move off the floor for a entire week even while under the constant influence of prescription pain killers. Does anyone have a clue what it could be?