Jittery Spells and their Causes

Sometimes, I just get jittery. I grind my teeth and get this antsy feeling in my muscles where they feel tense and desirous of being exhausted. My heart feels a little palpitation-y, and I just feel a generalized need to eat, move, fuck, and fight.

When I get this way, I usually notice it when I wake up gnashing and grinding my teeth after only sleeping for 5 hours or so. And when it comes on me, there's very little I can do to stop it. Exercise sometimes helps a little, but not always.

Does anybody know what the hell I"m talking about?

I haven't had one of these "spells" for quite a while. I was getting them pretty frequently last spring, and I finally got some tranquilizers from the doctor. Back then, I tried to pinpoint the cause by trying to find corrolary behavior, but I've had little success. I've indicted a variety of culprits...alcohol withdrawal, nicotine withdrawal, exercise withdrawal (if there is such a thing), dehydration,excessive caffeine intake, stress...but none of these, save a generalized stress, was consistently correlated with these antsy spells, and I'm always experiencing generalized stress.

Now I have a new culprit to indict...unrequited infatuation. There was a lot of that going on in my life last year. The last few months, not so much of it....perhaps more of it now again, and here I find myself in the grips of the "antsy-ness" this morning. Could this be my body's response to frustrated desire?

Of course, I did drink a butt-load of intense coffee yesterday...maybe that has something to do with it.