I agree with Robert, sound just like the reaction I get from sugar alcohols.

Also the first thing I thought of when reading the ingredients was sucralose -> isn't that a sugar. I thought that anything that ended in ose was a sugar according to Atkins. So the drink couldn't have been low carb. Another reason to agree with Robert.

Easy enought to check out the problem though, stop drink the shake. See if that clears everything up. And if you really want to test it, in a week or more after you are back to normal, try the drink again.