Stomach Spasms with Nausea and Vomiting

I have been having bouts of stomach spasms directly in the center of my abdomen - I get a severe bout about once/year - I had my gall bladder removed about 7 years ago and that was my first episode.  I usually get one bout a year since then..  It starts with mild pains and spasms in my middle abdomen and then becomes more and more severe as the evening progresses resulting in severe nausea and vomiting and spasms that feel like contractions every 5 or 10 minutes.  When the spasms occur, I become extremely nauseaus.  They last about 30 seconds and then subside and then return.  This usually lasts about 12 hours and I am extremely sick the entire time.  The pain radiates into my back when th spasm starts.  I always thought I had the stomach flu but this is definitely something different.  Any suggestions?  My daughter was just diagnosed with a gastric ulcer and they have done tests for the H Pylori bacteria.  Not sure if I culd have the same thing?