MS Contin is a very strong pain reliever; its possible you may have to take more of another kind in order to achieve the same results. If oxycontin is not a possibility have you thought of Vicodin? Vicodin contains hydrocodone - a different kind of narcotic drug and acetaminophen. It does not come in an extended release form, however, and needs to be taken every four to six hours.
For more information on Vicodin and hydrocodone see below.
http://www.healthsquare.com/newrx/vic1480.htm