I drink 7 cups of coffee a day to stay awake, and figured I'd try one of these things. They are nasty, and they make you really uncomfortable. I was jittery and had a pounding headache the entire time. DO NOT BUY IT!
I'm with Zoom.. If you really need 7 cups of coffee a day to function, then you have a serious dependency problem, AKA serious addiction. I'm not a doctor, but I am a thinker, and I think that's got to be really bad for your health. If you're young your body will handle it OK now, but it will screw you up as you get older.
If I understand you correctly and you tried this product instead of your usual pot of coffee, then I'm gonna go out on a limb and say that the jitters and headache where from caffeine withdrawal and had nothing to do with the product.