My stomach cramps horribly when I take any protein.. What should I do?

I am 4 weeks post-op and can not get my protein in due to how sick it makes me. I ordered several samples from the internet and the first one I tried tasted okay but after maybe 2 oz., my stomach hurt so bad it made me throw up. Could I actually be allergic to protein? Does anyone else have this problem and how did you overcome it? Also, I know that I can eat cottage cheese and drink skim milk but it seems that bothers me too. Any info would be much appreciated. Thanks

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