I would call your Dr. BEFORE you can not control your pain. I just went through a similar situation and believe me it was not easy. He needs to know that the meds are not controlling you pain like it should.Call before you take more that he prescribed, and buy that time you will have to tough it out!!!
I suggest keeping yourself as stress free and you can while going through this. I started keeping a pain journal this morning so that I can better communicate my pain levels to my Dr.