Severe vomiting every few weeks for last two years

I have been dealing with severe vomiting and stomach pain every few weeks (that will last from 1-3 days) for the last three years. Had gallbladder removed two years ago but vomiting episodes continued. Was then told I had cyclic vomiting syndrome. Have had 2 endoscopes (first one showed mild gastrisits and second one was normal). Just recently had a CT scan in ER and was told it is colitis. Have an appt with my GI next week. Has anyone ever dealt with something like this?