What To Do For Severe Chornic Back Pain?

Hi i am a fifty year old healthy male except I suffer from severe chronic back pain I m been taking 3 OxyContin 80mg a day and 4 roxicodone30mg for breakthrough pain every 4 to 6 hrs. As needed I ve been on this protocol for a year now my online pharmacy doesn t want to fill my roxicodone unless I lower the 4 roxicodone 30mgs. To 8 15mgs. A day how should my dr. Write the prescription