It might help to have a complete hystorectomy. If your determined to get rid of this on going torture, your gynocologist will understand. God bless you Rachel.
I had similar problems. Every month, right before my period, I would get so sick that I ended up in the hospital every time. Turned out it was my bladder spasming and causing all the problems. So if your GI workup doesn't pan out for you, it's something to think about. Some people are more sensitive to this type of pain than others.