Hair falling out

Shelby

Hey !!! I need some help , for the past 3 or 4 months I’ve noticed that a lot of my hair is coming out in the shower and when I brush it . I’ve changed my shampoo so many times to fix the problem but nothing is working . I have really thick curly hair and I do straighten it sometimes but I use a heat protection. Does anyone have any suggestions what to do or have any shampoos or anything to help this .