Thank you for the information.
There are several causes of tremor of hands-
These can be
Stress, anxiety, or fatigue
Excessive alcohol, coffee
Low blood sugar
Brain disorder like Parkinson
's disease, Multiple sclerosis,stroke etc. Hyperthyroidism
The numbing sensation are can also be due to many of those conditions.
When it affects ring & little finger ulner nerve pinching or its root can also be there.
The other causes are like low calcium or electrolytes (for which you were tested), vitamins , thyroid
diseases, diabetes etc.
Though anxiety is possible but it is safe to get an examination by a neurologist.
I hope this information will be helpful.
Please ask if you need any clarification.