The last two months i have been experiancing sever sharp pains in my butt cheeks and legs/siatica.. what helps for this?

Need accurate : I would suggest evaluation by a physiatrist or neurologist for pain in the legs. Diagnosis can range from lumbar sprain, si joint dysfunction, lumbar spinal stenosis, lumbar radiculopathy, and peripheral neuropathy. Treatment including physical therapy, tens units, medications, trigger point injections, end epidurals would all be dependent upon an accurate diagnosis.

Pinched Nerve: Sounds like you have a pinched nerve in your back. I would suggest seeing a pain/spine specialist to evaluate you further to evaluate what level and what can be done to treat you. There are interventional treatments besides medications and surgeries that might reduce or eliminate the pain altogether.