I just wanted to add to something Slimcharm said about other ideas for shakes -- I'm not against Slim Fast or anything, and I've never actually tried it. But I just thought I'd share info on the shakes I drink in case anyone's interested.
I drink the EAS Carb AdvantEdge shakes. They're 100 cals, 1 gram impact carbs, 3 grams fat, and 15 grams protein. They come ready-made in about 5 different flavors, and also in big tubs of powder so you can make your own, add fruit, milk, etc.
Just an FYI for anyone wanting info on shakes
Good luck!!! You can do it!