in one hand doesn't look to be a specific condition due to diabetes
and there may be other reasons for it like it could be...
...benign essential tremor
...some side effect of some medication
....over active thyroid
....early sign of parkinsonism
The way you are describing your symptoms,it looks to be benign essential tremor.
The only symptom in essential tremor is tremor. If you have other symptoms, then you may have a different condition.
In essential tremor, the tremor usually begins in one arm or hand. Within 1-2 years, the other arm is likely to be affected. Very occasionally, it may also spread to involve the legs.
There is no test to diagnose essential tremor. Your doctor can usually diagnose essential tremor based on your explanation of the tremor and an examination. It is important for the doctor to make sure that there are no other conditions present that are causing tremor.
You must consult a neurologist
and get blood tests and MRI
BRAIN,to rule out other conditions.
Once the cause is found,treatment can be planned.