What Can I Do To Manage Constant Pain And Tightness From My Knee To My Buttock?

Hi I ve been suffering from sciatica since October 2019. the pain has gone from my back and I don t get any more shooting pains up my leg. However I have constant pain or aching from back of knee up to buttock, tightness like constant cramp. I take pain killers when needed but noticed my stomach getting bigger. Have you any advice please.