Occasional severe bloating, sharp pains in abdomen. slight gas. no period due. whats wrong?

Irritable bowel: Sounds like irritable bowel syndrome, for persistent diarrhea, severe pain, nausea, vomiting, weight loss or blood in your stool you should see your doctor. Otherwise you might try a probiotic such as align or a fiber suppliment to see if this will help. If your symptoms persist you should again see your doctor.

Agree w/ SV: Try stopping all caffiene and cutting back on acidic beverages. Stress reduction is helpful as well.