You do need carbs but try to go for the complex
carbs that take longer to break down and simple
carbs like sugar. Fruits and veggies both have fiber (complex carb), plus there's whole wheat bread, oatmeal, cereals, etc.
Simple carbs enter your blood stream very quickly and your blood sugar spikes, then all of a sudden it crashes and you hit rock bottom, get that weak, shaky, maybe even light headed feeling. By staying with the protein and complex carbs, you can help avoid that.