I’m having surgery in October but have been trying all different brands ahead of time to see which I like best. So far, I like the taste of Boost & Premier the best but shortly after drinking either of them, I get a bad stomach ache and have to run to the bathroom. I suspect that this is due a sensitivity I have to artificial sugars. The same thing happens if I try to eat sugar free jello or anything like that. I’m getting very nervous because I don’t want to be sick for 2 weeks and my dietician doesn’t have much of a solution for me. She told me to keep trying brands until one doesn’t make me sick but I have the same issue with Ensure and Glucerna. Anyone have a similar experience?