Brain injury from fatigue?

ive been playing too much video games and getting not enough sleep for the past two months. lately ive been noticing that my cognitive functions have decreased and that im sleepy a lot. so ive been properly taking care of myself for the last week but the symptoms are persistent. i have trouble articulating, focusing, my memory is poor, my reflex is poor and im in a bad mood all the time. too much video game might be a silly thing but this game had me excited and angry all day and nite. for two months with bad sleep. isn't it possible i got a brain injury from my negligence?