Sorry to hear that. I suffer from IBS ad well. Before I knew what was wrong, I was nausea, lost weight and was constipated. My dr recommended the FODMAP diet.(google it) Did that for a few weeks and found out some of my trigger foods. You said you couldn't do fiber, it helped alot. I take the liquid Metamucil every night. Make sure to drink plenty of water. I also take the IBGARD peppermint capsules everyday. Good luck. Hope you feel better