My husband is 68. He has a herniated disc, gout and rheumatoid arthritis. They gave him Percocet for the pain of the herniated disc. For the last 4 days he has had stomach and abdominal pain, painful to the touch as well, vomiting, diarrhea. has slept of the time. He is also weak. I am giving him clear liquids and PowerAde, he stopped the Percocet 3 days ago but is still having all the symptoms. What can it be and what do I do?