How to combat greasy hair, itch, dandruff, and hair loss?

I'm 16 years old and I've been having mild to severe hair loss in that I always see my hair falling out, I can see my scalp easily through my hair, and i get about 20 hairs on my hands from just shampooing. For the past 2 years I've had greasy hair and dandruff that's progressively getting worse (along with the hair loss). About 15-20 hours after shampooing, my hair gets very greasy and it looks almost as though I have wax or gel in my hair (people have told me) and so I must shampoo everyday to keep my hair looking mildly normal. Also I've had pretty bad dandruff that I can see along with the hair fall. Also my scalp gets VERY itchy randomly (even after I shower) and especially itchy if i havent showered for 15+ hours. I'm using prescription dandruff shampoo and the dandruff is getting a little better but the hair loss, itchiness, and greasiness seem to be getting worse by the day. What can I do about this? What's going on?How to combat greasy hair, itch, dandruff, and hair loss?
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