Is there a way to alleviate hair loss symptoms?

My hair keeps falling out whenever I shampoo.

It really upsets me to see the drain full of fallen hair after washing my hair. No matter how much I try to prevent hair loss—whether by washing gently or not, or even by massaging my hair with my palms instead of my fingernails because I heard it reduces shedding—my hair still falls out frequently.

Also, even though I use a hair loss shampoo designed to alleviate symptoms, I always find hair falling out after shampooing.

How can I alleviate hair loss symptoms?