I'm sorry to hear you're going through this, I am in the exact same boat. I'm exactly one week post op and am lucky to get in 45 ounces of Water and haven't been able to tolerate any of the Protein stuff I bought before surgery. Even the smell turns my stomach now. I'm starting to feel weak and haven't been walking like I should because I'm concerned about it pushing me even closer to dehydration.
My nutritionist suggested sugar free Carnation to try next. I certainly hope this gets better soon - I'm definitely having buyers remorse at this point.
Hope your luck turns around soon...