What causes abdominal cramping nausea diarrhea lower back pain with no missed period?

You might try taking some aspirin. It works for things that people never consider using it for like scratchy throat. I always use BC Powder, but any good aspirin like Bayer or Bufferin may help. My stomach was nauseated last month, and a BC Powder fixed it like 2 to 3 minutes. I was amazed.