Help! My hair is breaking!!?

I recently had Japanese hair straightening. I noticed that I was losing a lot of hair, but didn't take action until this week. i think i really damaged it more 2 weeks ago when I flat-ironed my hair too much for 3 consecutive days. now, about 1" off my roots, my hair have this "pointy" fold, and the breakage starts there. my breakage is really bad, and my hair is really thinning out. i have all these short hair sticking out. please help! im really desperate. i used nexxus emergencee tonight, hoping it will help. advice is badly needed. thank you all!