Can scalp itching and hair loss be resolved with scalp scaling?

Lately, my scalp has been itchy frequently, and I am worried because I am losing much more hair than before. Changing my shampoo hasn't helped with the symptoms, so I am considering seeing a dermatologist. People around me have said that scalp scaling or hair loss injections are effective, and I am wondering if they really do help. I am also curious if the procedure is painful and how many treatments are typically required to see results. I would appreciate it if those who have experienced these treatments could share their honest reviews regarding costs and side effects.