I've hypertrophic osteoarthropathy. i'm trying to study but i've severe pain in my neck and lower back. i was prescribed 200 mg celecoxib and tylenol. now i'm getting abdominal pains probably due to celecoxib and so i've left taking. any suggestion?

Celecoxib is a COX-2 inhibitor so it usually does not cause upset stomach but sometimes it does. Please note that we use celecoxib for patients with history of gastritis, PUD, GERD, etc. when they need NSAID. You should talk to the prescriber or you can try a histamine 2 blocker (famotidine, cimetidine) or a proton pump inhibitor (omeprazole, pantoprazole, etc.) as a trial for that side effect.