I am embarrassed to ask this but going to anyway as I cannot figure it out and it scares me. I am 8 weeks out from a L5 lumbar laminectomy discectomy and have experienced server rectal pain/pressure now on 4 separate occasions. Once right before surgery and then the others have been during my recovery. It happens in the middle of the night (as you can tell from my posting time). The pain doesn't last very long but it wakes me up and scares me. Is this muscle spasms? Has anyone had this happen to them?