Does your tremor disappear when you reach for and grasp something, or does it disappear when at rest? I've observed a PD tremor in a hand at rest going at a fairly slow rate, which I've read is somewhere around 6-7 Hz, unlike an essential tremor where the hand trembles rapidly when trying to do something. Also PD tremor is not affected by alcohol consumption, while essential tremor is.

Having said all that, I have to tell you I am not a doctor, and that there are several hundred ailments that involve a tremor.