I'm afraid this is something you will need to discuss with your healthcare provider as they know your personal health history. Each person is unique in what our bodies can and cannot handle. In the meantime, maybe lower the amount of fiber in your diet and look into possible foods that you may be intolerable to. Hopefully the Dr. helped you with some dietary recommendations post surgery. Most often with a gallbladder removal, you'll need to reduce consumption of high fat foods - spread out fats more evenly throughout the day and maybe limit to about 3-5g/meal (discuss w/ your Dr. or RD). In addition eating small, frequent meals vs. a few large ones. Also, avoiding dairy (especially the full fat versions like whole milk, ice cream and cheese) could be helpful with digestion and your IBS symptoms.