I agree with AnnD, go get a blood test asap. When I was taking alot of Percocet, I got this "pain" in my right side (stomach). I casually mentioned this to my doctor and he flipped! He requested a blood test - when it came back, my liver counts were so high, I was borderline jaundice. Jaundice in adults can be fatal.
It's worth checking into. You can't afford not to...
emsmom