Hair loss shampoo

Maybe because I've been under a lot of stress lately, my hair has become very thin, and every time I wash or blow-dry my hair, a lot of hair falls out...ㅠㅠ

Even after buying and using products that are said to be good for hair loss, I don't really notice any effects. Could you recommend a shampoo for hair loss that makes hair thicker or prevents hair from falling out?

I've never used a hair loss shampoo before, so I'm planning to buy and try it.