My hair is falling out like crazy !! Anytime I even touch it I get a handful of hair in my hand !…

My hair is falling out like crazy !! Anytime I even touch it I get a handful of hair in my hand ! I'm bringing it up at my appointment on the 30th but should I be worried I've got a vitamin deficiency or something my last pregnancy my hair was super full and gorgeous! Plus any tips on how to stop it you can see my scalp at the front