What Causes Dizziness And Hand Jerking While On Selzic?

am a student and i travel a long distance of about 50 km daily each side by metro and i am also taking selzic od 450 mg in the mrng n 600 at night daily !! it gets very tiring for me n sometimes on the way i feel dizzy and and i get the feeling of my right hand jerking for a few seconds !! it...