I need a protein shake that doesn't cause massive diarrhea!

I am two weeks post-op, and I'm supposed to be drinking two protein shakes a day. However, everytime I try one I get really bad diarrhea. I seem to tolerate Carnation Instant Breakfast OK, but it really doesn't have a lot of protein in it. I ordered samples from Vitalady.com (thanks Michelle!), but the diarrhea is so bad that my butt even hurts! Any suggetions? Thanks!

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