I used to drink protein shakes all the time and had no problems what so ever but for the last several months everytime I have one whether it's RTD or made I end up having severe pain in my stomach. I believe it's an air bubble, I usually have to rub and rub and shake my tummy around to get it to move. After it's over it sometimes just leaves me wore out. Why would I have such trouble now and not just after surgery (i'm 16 months out)? Anyone else have this happen to them? On a similar topic I have an unopened can of Vanilla Latte Click, first to ask for it can have it!