Stomach problems with Preop TMI maybe

I am just wondering if anyone else out there has had stomach issues with the protein shakes. I have had nausea and diarrhea this whole time and today it is worse. I tried a different type of protein from GNC it is still whey. I thought whey was suppose to be the best out there to digest and I am not lactose intolerant never have been so I know it is not that. Now I am not ruling out the fact that I may have a little stomach virus over the past two days when it has been its worse but, I've had problems this whole time. It's actually helped I am not hungry and I've made extra sure not to get dehydrated but its really starting to get annoying. Anyone else go through this? Surgery is tuesday and I really don't want this to interfere