I was on my feet for three days. And now I have lower back pain where I cant stand, sit, or lay down with out it hurting. I was laying down and turn wrong and I had a sharp pain up my whole back. I couldnt move for a little bit. Now I cant really do anything. What could have caused this, and how I can I  fix this pain.
Could be some acute sprain or even a disc problem of spine.  Get evaluation by orthopedic specialist who on physical tests can determine the origin of pain and whether radiological tests are required for diagnosis. In mean time take combination of methocarbamol 750 mg and ibuprofen 400 mg thrice a day after meals, apply hot packs, take firm mattress to lie down and maintain the most pain free posture on lying down in any position.