WHAT CAUSES YOU TO THROUGH UP FOAM

I'm 6 weeks post op and did not have a problem until today. I ate my lunch, took two bites of sea bass and almost immediately got the pain that radiates to the back, so I stopped eating. I thought the fish was prepared with too much oil so I thought it might be that. The pain persisted for about an hour and a half, drank some water and threw up only foam and water. Then I felt fine. What causes this?? I've talked to many post ops and they say that this happens sometimes. OK, but what is it?

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