I have eaten sushi also a few times and have never had aproblem. I have only had it while I was feeling relatively well to begin with never feeling flarish.
As for worrying, it is normal, I have had a few times of concern and have never been so happy to hear myself fart!!!! LOL. If the gas is moving everything else should be moving too.
IBD(undetermined) 04-'07....Gastritis 04-'08....Fibro & CFS dx 06-'08
Asacol & Buscopan-IBD, Pantoloc-Gastritis, Nortriptyline-Fibro/CFS, Pramipexole-Fibro,
Diazepam, demerol, codiene for pain
b12 inj, fish oil, folic acid, acidophilus.