Stress and Imbalance

The first thing you should do is give up the caffeine,  totally, at least for now.  Caffeine is one of the worst things you could do for headaches... it actually causes them.  You might be stressed, or tired at work, but try something else, maybe even getting an energy drink from jamba juice.  The chemical imbalance you're speaking of, sounds like it has started from you're increased intake of caffeine.  Try drinking decaf coffee if you really love coffee.  Try drinking tea, which can be very relaxing.  Good luck.

Long term stress can cause headaches, along with lots of other health problems.  If stress carries on for a prolonged period of time, you can start to suffer from hormonal imbalances.  Caffeine intake may not be helping with the headaches either, as you can easily become dehydrated.  You should look for some other ways to link