Thank you for the encouraging words. I have back pain most of the time (but it started after April 8th when I had a gyn appt. I did not have it then, although I had some of the "nighttime attacks") It is not the same type of pain I remember when I had periods. That was more of a generalized ache. This is very specific pain. Another weird thing is that it actually improves by standing up and walking around. I only get the severe attacks while lying down and only during the night. My doctor said the getting up part was consistent with some lumbar spine conditions but did not elaborate.
I have yet to find anything on the Internet or other doctors forums that say that a back problem can cause ONLY abdominal (or pelvic) pain. Yet I know someone who this actually happened to. She did have a bad back which she new about, so she probably had back pain at the time of the incident, but what brought her to the ER was excruciating abdominal (low) pain. They did all the usual tests, all negative. They called her doctor who told them it was her back. They didn't xray her back. She later had an MRI ordered by her doctor which showed a congenital defect in the spine.