I have been on percocet 10/325 off and on for 6 months for chronic back pain. all the sudden (overnight) it stopped working and makes me nauseous.

Meds not best choice: Pain medication does not heal your problem, just helps ease your path. Nausea is a common side effect of percocet. There are foods that make Percocet not work. Most lower back pain is from muscle and fascia. Suggest to look up and learn about myofascial pain. There is much that can be done to help you, and your pain is not likely to be from disc, or pinched nerve.

Find pain cause: There are a number structures other than muscle or fascia that cause low back pain which can be treated by a spine specialist. Long-term management of musculoskeletal pain with narcotics is inappropriate. If you pain is bad enough to require medications that strong, you should definitely see a spine specialist.