Hi Mr Jayanta,
Thank you for posting your query.
Based on your symptoms, there are two likely possibilities:
1. Essential tremors
2. Writer's cramp
In both these conditions, shivering may occur while writing, making it very poor handwriting. Problems get worse with anxiety
There are good medications available to treat them, such as beta blockers, pacitane, etc.
would be able to guide you regarding the best medications.
Dr Sudhir Kumar MD DM (Neurology)
Senior Consultant Neurologist