Nausea is tough and I know it can be difficult to live with, especially on a daily basis. It is one of my most hated side-effects. I'd literally rather take physical pain in my foot or hand or neck even over nausea. At least that's something I know how to handle and doesn't make everything else much worse! I'm sure you know what I mean. We do have some information on IBS and nausea, though, if you'd like to check it out:
https://irritablebowelsyndrome.net/symptoms/nausea-sign-symptom-of-ibs
If nothing else, maybe it will give you a place to start. Just know you are not alone in this! Keep on keepin' on, DPM