I can’t move

Patient: I have extreme lower back pain whenever I lay on my back or lean on one leg for too long. It doesn’t hurt too much if I stay still but when I try to move it’s agony! It just happened now and I’m stuck laying down, I can’t move!!!! I was lucky that the laptop was right next to me. It seems to be the lower right side at the moment, but I can’t remember if it’s that side every time. Please help me!!!! It’s really bad, it’s agonising.