You can waste your money trying all different kinds of protein powder hoping to find the one that tastes just like a chocolate milk shake... but it's not gonna happen. Muscle Milk comes pretty damn close, but it sounds like you're looking for a low-fat, low-carb shake.
My advice: suck it up and chug it down. Sweetener will make it more tolerable, but you're just gonna have to get used to the taste of it.
I think I've lost all of my taste buds. It's amazing the things I throw in a blender these days! My family practically vomits at the sight