Is there a recommended number of hair loss treatments?

Lately, the amount of hair falling on the floor every time I wash and dry my hair is unbelievable, and it really gives me a scare... The crown of my head and the parting line look particularly sparse, so it bothers me and stresses me out every time I look in the mirror.

I've tried changing my shampoo and taking supplements, but it feels like there's a limit to what I can do, so I'm thinking of getting some professional hair loss treatment. I've heard that there is a really wide variety of effective treatments available these days, such as scalp scaling and injection therapies!

How many sessions are typically recommended to see noticeable results from this type of hair loss treatment? I don't think one or two sessions will be enough, so I'm wondering if I need to receive at least 5 to 10 sessions consistently to strengthen my hair!