Blimey, with all that sugar I'm surprised you still have any teeth! I think this is your problem as to why you lack energy, if you are taking in far too many useless carbs in the form of sugar, they give you little hits of energy for a short period of time but after the hit is a longer drawn out come-down which makes you tired.

Try drinking less coffee with only 1 sugar at a time to start off with. The best thing to drink throughout the day for sustained hydration and alertness is water, boring I know.

Failing that, try sampling some of Nova's Nettle Tea and Unicorn piss - helps him stay harder for longer.......apparently.