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Hello and welcome. I'm Dr Chip
Why were you given the gabapentin--for the involuntary movements?
OK Mark--have you had any scans or blood work to determine the tremor problem?
OK. While this could be what's known as benign idiopathic tremor, it could be a carpal tunnel syndrome problem or a disk problem in your neck.
Were I your doctor I'd start with nerve conduction studies of your arms and if that indicated a cervical disk problem and not CTS I'd get an MRI of your neck.
Please let me know if you need any more information