I suffer with ibs. You have to limit your fruit and peppermint tea can agravate ibs. Try plain green tea. I use an app called Monash University for portion sizes of fruit and veg to eat. I can't do any slimming plan as I need to be strict so I don't have an ibs attack.
Too much fruit can ferment in your stomach and you should leave a gap of 2 hours between each serving.
If your Dr has diagnosed you with ibs ask him/her to refer you to a nutrionist.