Thanks for posting,
Your symptoms are similar to IBS
but it will be wise that other possible infectious causes of the above symptoms be ruled out first. I suggest you get a stool exams done and maybe placed on antibiotics (after tests of course). If food intolerance
and infection are ruled out, IBS could be the most probable cause of above symptoms and that means you will need to constantly be placed on symptomatic treatment and also change your diet and lifestyle in order to be able to management the IBS and feel lesser symptoms. It is possible that your birth control pills could have aggravated the situation.
Hope this helps