if the eel was fumigated maybe that's causing a bit of an issue. honestly your case of the nerves over being forced to eat something is likely to be the main cause of this especially if they are not having diarrhea. or you could have gotten it from some other issue that's happening at the same time. sushi and sashimi have to be prepared under some pretty high standards in most cases i'd trust it more than a regular hamburger.
diarrhea worried about anisakis. yesterday i went to an asian restaurant and my friends basically forced me into eating eel sushi roll i think it was fumigated due to the color and taste but i think it was raw. now this morning i got diarrhea and i'm burping a lot (sorry if i was so explicit but couldn't put that in any other way) and got a little bit of gastric acidity. now i don't think i have nausea i have a weird feel but it's probably because i'm stressing about it and i am a hypochondriac so it could be related to that.