Essential tremors during writing. Years.

I am suffering with essential tremors in my right hand while writing for last 20 yrs.when my age was 45 years .Initially I got mild pain in my rthumb which gradually converted to mild to severe tremors. Now I even can't draw straight or curved lines. Very difficult to sign properly on important documents like cheques etc. Tremors increase during anxiety, consciousness, hurry, excitement, nervousness and important papers.I am diabetic also for d same period of  20 yrs.and insulin supportive for last 10 yrs. I do all other works almost normally except this now I feel weekness in my right arm while holding filled glass for a while. These may not be Senile or Parkinson as tremors only while writing. Pl. suggest if there is any remedy for these essential tremors. Regards