I Shake When I Write. No Matter What Time Of

I shake when I write. No matter what time of day or night. I can't write a grocery list or write a check. This has been going on for over three years, but is getting worse. I feel very anxious trying to write. I try to hold my right hand with my left hand trying to steady my shaking, but it doesn't help. This is driving me nuts. What type of Doctor do I go? I have told my primary Doctor, he told me its tremors and that was it.