Dumping from GNC

I have been drinking a protein shake most every morning for the past three months. I have been drinking GNC's Optimum 100 % Whey Protein in Vanilla Ice Cream flavor. They have now "improved" the formula with faster-acting HYDROWHEY. This morning after drinking my shake I got dumping from it. I know it has to be the shake. I didn't have anything else. There is only 1 gram of sugar in the mix. I can't understand why I dump from it. It was totally unexpected. This was my second shake from the "new" formula. Anyone else had similar experience or are you able to tolerate the "new" formula? What do I do next--try it again- or find a new powder I like? I had to leave work today because of the dumping. I can't have that happen again. Please advise.

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