What Causes Extreme Low Back Pain?

My Recent MRI showed moderately severe degenerative disc changes to the L5 S1, uptake in Bone marrow, an Epidural Bulge and resulted in No definite nerve damage. It feels like I have crushed bones and heavy weights on my Lower Back but this pain is manageable. **The severe pain happens when get up from lying down. As I get up from Bed I feel Paralyzed by every move. I have a hard time getting up. It feels like my lower Back locks up and pinches a nerve while bending to get back up. To get out of Bed it I have to move very slowly while I experience major pain. Finally once I'm on my feet my Back is still hunched/stiffed & it takes me a while to straighten up. This whole process of an everyday activity is very painful and I'm afraid it's only going to get worse. It also happens when I sneeze/cough or if I move in a certain position. It comes like a stabbing pain to the back for just a second then goes away. If anyone has any info Please help..