I have been having strange abdominal "cramps" for about three months.  I've only had one period in the last year (generally post menopausal).  It mostly is just below the naval and resembles that feeling I use to get before my period, but it hasn't gone away.  I've had a sonogram, colonoscopy, pelvic exam, all negative.  Now they are starting to talk about CT scans (I'd rather avoid the radiation) but it is getting scary.  I don't see any "movement" but it does feel like something is moving in there everyonce in a while.