Percocet (acetaminophen/oxycodone) is highly unlikely yo be the reason for your gastroparesis. It is most likely idiopathic where the reason cannot be attributed to anything specific. The treatment of this condition is mainly symptomatic. Medications and dietary modifications like avoiding fatty foods and having small frequent meals can help in mild - moderate gastroparesis. If severe, then surgical options can be explored. It s not likely that it is reversible but can be effectively controlled even with only dietary modifications in some cases. You can discuss the above points with your gastroenterologist. Hope this helps. Thanks.