I have been taking OxyContin and oxycodone for a year in a half now. And it's starting not to work very well. I'm taking 2 60mg OxyContin daily and 4 15 mg oxycodone daily. And I can hardly feel any relief I tried to take a higher dosage and I still don't feel much difference. I'm going to see my pain Doctor next week should I ask him to change my meds to something else? Because I think I'm becoming immune to this medication no matter what dose I take. What should I ask him to change it to?