Hi, there. We aren't medical professionals here and could only guess about what your condition is. You might have something called familial tremor. Have you consulted with a doctor (particularly, a neurologist) about this? There are some medications that might work if it's familial tremor (this is something genetic), but you should get checked out to see if it might be caused by something else.
Sorry I couldn't be of more help, but I wish you luck in getting help for this.
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