New Here But Needs Some Advice!!

Hi, I'm new to this but I have some questions for you guys! Ya'll seem like ya'll could help.  Well, I started college last fall 2006 and I would stay up so late most of the time and be too tired or just lazy to wrap my hair and I think that I damaged it...The right side of my hair seems to be healthy, it has life and movement,but the left side is dead as a door knob and it doesn't seem to be growing. The right side will have like an inch of new growth a month and half after I've gotten a relaxer and the left was like a couple centimenters probably not that much because it doesn't really feel like new growth. I was also in a fight when I was in the eleventh grade and a girl pull my hair and ever since there's a spot at the back of my head that doesn't grow and is only a couple inches long.  My hair is mainly to  my shoulders and very thin.  Could someone plz help me and tell me what I should do! I would really appreciate it! Thanks!!!!!!

well, i'm using organics olive oil relaxer, silk elements leave-in moisturizer, silk elements shampoo and conditioner, and organics shea butter and tea tree oil moisturizer. I get a relaxer about every 2 months. And yes, I moisturize daily and I wash my hair every weekend.