had recently broke my arm and was given percocet 5-325. Had to have a plate and pins put in to stop movement and afterwards was prescribed lortab 5-325. Why is the lortabs not taking the pain away like the percocet did and whats the differnce between hydrocodone and oxycodone. Will either one of these meds give me really loose stool and upset stomach have been experiancing both since i started taking them