You could always try a fruit smoothie for a meal replacement instead of the protein shake although I really don't think one protein shake with each meal is going to make you get "huge". It's actually good for you and can help give you more energy.

I found a GREAT smoothie recipe that I've been using as a meal replacement for dinner. It calls for 1 frozen banana cut up into chunks, 1/4 c. frozen blueberries, 1/2 tbsp of honey (optional), 1/2 tsp of vanilla extract (optional), and 1/2 cup of juice. The recipe actually calls for orange juice, but most of the reviewers have used either other types of juice or vanilla soy milk. Personally I've been using just fat free skim milk and it tastes great. Many also substituted the blueberries with raspberries, although I myself have not tried it that way yet.