Sudden change of mood

When in the internet lab 2day , after er.... " teaching " for more than 2 hours , me , who is already very tired suddenly become no mood (b4 r still can sustain the tiredness) and kind of dizzy (@,@) . But i din work late up into the night last night o , mayb bcos of look into the monitor for a long time , since yesterday , haiz , wad can i do then ? Still need to finish the assignment , i cant do anything without computer . very afraid tat i will very a presbyopia lenses when i still haven't finish my course .. will ever a company hires such an "old gradute" ?