Why would a protein drink occassionally cause symptoms similar to dumping?

This has happened to me twice now, with two different protein drinks. After drinking my protein drink rather quickly, within about 15 minutes I began to feel nauseus, and sweat profusely. I also had diarrhea. Why does this occur? If I drink it at a slower pace, I don't have these symptoms. Does anyone else have this reaction, and do you know why?

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