Lactose/Dairy Intolerant- 17 Days pre-op, what can I drink for protein?

I am total dairy intolerant. My Doctor requires a liquid diet pre-op. His recommended liquid is Sugar Free Carnation Instant Breakfast. I tried that and I cannot use it. I have also tried Boost and Ensure (on doctors recommendation). They also didn't work out. All give me terrible stomach aches with headache and diarrea. I have to start Tuesday with something..... HELP!! please.

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