Why do I feel lousy, low, out of energy after the high coffee gives? I started drinking a lot of coffee after coming to college. I became instantly energized and social after grabbing a cup or two. But then at night I became extremely dull, unsocial-able, and quite depressed and completely lack of energy and I crashed into the bed just to wake up late in the mornings. Why is this happening?
This effect is known as caffeine withdrawal. It's normal that you may feel a bit loose of you don't have caffeine after a while. The whole set of adverse effects of caffeine withdrawal is enlisted as:


headache
fatigue
anxiety
irritability
depressed mood
difficulty concentrating


according to WebMD.