After I had my first child, I have had horrible problems with my back, right in my saccrum. It feels like my spine is going to snap into and I can't bend at my waist. When I lay down at night, my spine locks up and I can't roll over or even lift my leg. I am pregnant again and the doctor keeps saying it's because I am pregnant and my center of gravity is off, making me hurt. I honestly think something is wrong in my spine. Please give me some advice, my doctor isn't helping me at all, the Tylenol 3 doesn't help with the pain.