Sounds like me.....and for 6 years too. Im female 53 yo. Who came to this diagnosis? Did you have a colonoscopy and get checked for parasites?
I agree that probiotics are a good idea, although this will almost surely not solve your problems. If you are having gas problems, then you can try gas-x, but do not take handfuls. Only take what is recommend on the box or by your doctor. Have you had any testing done?
do this first; go to vitamin store; buy super high quantity pro-biotics enough to take 200 BILLION cultures daily for 2 weeks AND see if problems don't go away
in mean time buy some gas X which u can find at a dollar store and take handfuls if u want
drink only tap water, no soda
eat only skinless chicken, fish and add vegetable with little oil or butter, NO SAUSE
no junk food, no snack food, so sugar, candy, cake, pie, desserts etc etc
if in a week your problems r not gone, come back OR BETTER yet come back and tell us that your problems r gone
good luck