i' m 25 years old , when ever i play game or chat on mobile for more than 20 min i feel my litttle fingers and ring fingers of both hands numb  for a while and on doing simple hand exercise it resolves...same problem occurs with my back of the head when i lie straight on back for 20 min it effects more with more time, i am a dentist and have some sort of exam in three months so have to study alot but my memory has become worsen with time period i don't know what to do....plz help me out why does iy happens again and again and what to do as my mom don't allow me to consult neurologist