thinning hair

I don't know why I start losing my hair. My hair get damaged at the edges. Hair line is receding. I am taking too much stress for it and I am very worried about it. Please suggest me some solution of this problem. I am not gonna bald in young age em just 23. :(:(

My hair was always very fine and on the thin side (unlike the rest of me :) ) I have noticed my hair Is getting really really thin, in fact my colleague commented on it the other day and said I should take a supplement, can anyone recommend something that wont impact my CD diet and weight...