Sounds like a pinched Sciatic nerve and chiropractic is great for that. But, with pain that severe, you may want to go to the ER. First, they'll give you pain meds. Even if it's just a pinched nerve, being in that much pain causes the muscles to bunch & spasm which causes MORE pain. They will do X-Rays, possibly an MRI, and that's all good. If the hospital test come out negative, at least you'll know.