What are the medicines you have tried for IBS?
Your symptoms do suggest IBS. IBS is a functional disorder and thus there are no abnormality on endoscopy / colonoscopy. Since dicyclomine has not helped you; various other medications need to be tried as following;
2) Hyoscyamine sulfate
Various combinations are given from above if Dicyclomine is not effective. You may talk to your doctor about these medicines.
Please feel free for your follow up questions.