Hello ma'am and welcome.
The pills are to help prevent any future menstrual irregularities and to help prevent the cysts from growing or getting complicated, so I would advise you not to discontinue the pills.
Your problem is not just related to your periods, it is about the complications that can result in the long run. If the pills are irritsting your IBS
, please find another treatment option for the condition you habe been diagnosed with that does not interfere with your IBS.
Hope this helps.