I had no idea this problem was so common. I have had this issue come up in the past year or so. I had ultrasound after ultrasound because or painful cramps and heavy bleeding and they never found anything. A couple of months ago I had an abnormal precancerous cells on my cervix and the option for a hysterectomy came up. I was hesitant at first but after a couple more nightmare periods accompanied by excruciating bowel movements i decided to go for it expecting all my problems to go away. Here I am 10 days post-op with no uterus no tubes and still this same pain with bowel movements and passing gas. My surgery was done laparoscopic and she even said my ovaries were fine. I have an appointment with my gyno this week i hope she has some type of answer and not just tell me it's post-op pain.
I also have endometriosis and only have bowel problems at menstruation time.
Like many others here, normal painkillers such as ibuprofen and paracetamol don't touch the pain at all, for me.