Scalp inches so bad to the point it burns

For refrence i have thick straight hair, my scalp sweats A LOt and i have quite bad dandruff, whenever i shower, for like a day after it itches so bad to the point i have to itch it with a knife to help, and sometiems its really oily where the itching is i just don’t know what to do anymore since i have so much dandruff and showering seems to make it worse.