What Causes Tremors In Hands And Anxiety?

hi i m male 21..earlier i used to write properly and had no problem while playing carrom...now i see that while i write i find it too difficult to make smooth curves or to write faster...i even find my hands or fingers shivering if i suspend my hand in air...and also the carrom in which i used to be a brilliant player only 3 yrs ago, now i am a below average player..my hands become stiff while releasing the striker and i become too conscious of my shots. And a feeling of restlessness and anxiousness also comes up too often nowadays. What might be the problem?? please help me...

p.s. - I am a healthy boy with no serious health problems in the past.