sounds like me. I went through two strengths of Vicodin, took percocet and Lortabs. But, I was throwing up four hours after I would take them. I don't know if this is a stretch or not, but I realized my vomiting was related to two things: Constipation and caffeine. I take two stool softners every night w/bms in the am, and drink caffeine free soda (I can tolerate fountain soda okay though). Are you regular? I know this is a little off to ask, but your bowels can screw ya up pretty bad. Now, I don't vomit anymore or even get nauseated. I can take percocet no problem. I hope the problem is as simple as that. If not, you could try dramamine, my dr recommended that at first when I was getting sick.