i was discharged last week from my pain management doctor because according to them, i tested negative for the meds they prescribe, but positive for one im not prescribed. im on opana er (oxymorphone) 5mg x2 day, neurantin 300mg x3 day, hydrocodone 7.5mg x1 day, ambien 10mg x1 night, synthroid 225mcg x1 night, alegra180 mg x1 day, and benedryl as needed. I have thyroid cancer, a poor diet, drink soda all the time, and am overweight. I tested postive however for oxycodone, which im not taking. i was told by my doctor that the opana would test positive only for oxymorphone, and not oxycode. I have NEVER abused ANY drugs, and have a low tolerance for most of these medications, how can i prove that there was a mistake?