Losing hair/ really thin hair!

Honey

I feel like I lose so much hair through out the day! This is just when I shower/bathe. Every time I brush my hair or put it up in a bun or something I have hair come out. My hair is SUPER thin too so it’s the worst! I’ve been having this issue for years now, I’ve tried shampoos but nothing. For those with thin hair - do you take vitamins to help it? 😫