Coffee and energy

I am about ready to keel over......the usual mid afternoon zombie like state I always get into....debating whether or not to just start relying on coffee to get me through the days. I am not a heavy coffee drinker at most I will take in about a cup a day. Might move to three.....don't want to be so wired that I end up as an insomiac....then it defeats the purpose of what I am trying to do.

I tried Vitamin B-12, St. John's Wort, 5 hour energy drink and still....the zombies.

ARGH!