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It is difficult to characterize your
tremorEssential tremor
Familial tremor
Hand tremor
Tremor without more information, specifically the sort of information which can only be obtained by a detailed neurological examination.
I do not think you are ' going nuts ', anxiety can manifest in a variety of ways including tremor, however clonazepam is used in a number of disorders apart from anxiety.
These include epilepsy and it has some role in treating tremor.
Your physician could have used it for either reason, or possibly a combination of both, either way it seems to be working, but I would suggest that you ask him which is the promary diagnosis he has in mind.