Lucky you, but it will be exercising yer heart. And not necessarily in a beneficial way. Caffeiene makes the heart pump faster.
I have heard of people who own a coffee shop who found out about the headaches. It is all about how the body clock pumps out compensatory hormones to counteract the caffeine, and they constrict blood vessels, which without caffeine in the brain, become a headache. I got the effect with mere instant coffee.