Medical question, concentration and dizzyness.?

I am concerned about a problem i have been having, i play a lot of video games, im pretty sure my nutrition is proper (healthy food) however my average amount of sleep is 6 hours.... if i dont smoke for more than 3 days i get extreme bouts of dizzyness, when i hear loud noises excluding music i get dizzy and cant focus... i also have problems with inconsitant though patters, they jump around a lot and i cant focus much,,,,, most of this is treated easily with smoking but i dont want to really on smoking to solve this issue. Should i see a doctor about this or just focus on drinking more water and getting more sleep?... was wondering if this is degenerative or whats going on.