What Causes Constipation, Stomach Ache And Headache During Menses?

I have had 2 experiences within the past 4 weeks that concern me. Severe stomach pain that last several hours . Constipation - only those days - I don t usually have constipation issues. The pain is like a cramp and lasts for maybe 20 seconds - but comes and goes for several hours Tums does nothing - Tagamet does nothing - Also I have been sweaty the first hour or so - feel like vomiting - but don t. Then things calm down like 10 hours later. Then the next day I feel like I have a tender abdomen - and like I ve had a flu. Headache and like I m fighting a mild infection. My mother has diagnosed me with gallbladder disease (no she never went to med school) Any thoughts?