I'd go to the doctor, start off with stool testing, blood tests and referral to GI if nothing obvious discovered. If no problems found with digestive system, check ovaries. IBS that develops in woman over the age of 40, feeling of fullness and weight gain around abdomen can all be associated with ovarian problems - but this may be as simple as a parasite. Hope it goes well.
Post Edited (London Lurker) : 8/28/2015 12:38:08 PM (GMT-6)