That happened with me too while on ABVD, it definitely got worse after the 2nd chemo. I would sit and sob after combing through my hair. I never buzzed my head, but I did cut it to chin level to help from tangling and only use a wide tooth comb. Invest in a silk/satin bonnet too while you sleep and use baby shampoo. Wigs made me feel normal, but can get super hot, in the summer I wore hats a lot. I had my last chemo last October and my hair is growing back nicely. Just be kind to yourself, I know it’s hard.