Help!
Have you tried any other shakes? Do you have any problems with any other milk based drinks? I didn't have problems with the Premier drinks, but that's because I couldn't drink them (can't have anything milk based). But some people have noticed that they are more sensitive to milk post surgery. As long as you are drinking small sips slowly out of a glass, I'm not sure what, other than it being milk based, might cause the gas.
Cathy
I mix my protein with lactose free milk and don't seem to have any problems. My surgery was March 27. I use the Unjury unflavoured protein powder and add flavours to it. I don't enjoy it that much, but it works! Gas-x should help with the gas. What does your weight management clinic say about treating gas?