Will I gain a lot of weight if I eat little for breakfast and exercise, eat more at lunch and dinner but not exercising after that? I starve then eat.

Starve and eat. creates blood sugar fluctuations so you may become moody and fatigued. Starving yourself can provoke you body to store fat to protect itself. Please see your doctor and ask about low carb higher protein food plan. Good fat is good for you and it will create a feeling of satiety, thus you won't feel so starved. Peace and good health. Exercise once daily if doc says your health is ok for that.