My scalp is itchy with dandruff-like particles stuck to it. it also gets oily very soon.?

also my hair appears oily & kind of greasy with a lot of fly aways. though my hair looks & feels good the nxt day after washin it, by night my hair problem starts makin me look tired. i want to look & feel breezy & clean, but cant risk to wash my hair everyday as i am afraid my hair will become dry & brittle. i have tried a lot of remedies like amla-shikakai, hair masque, & other specialized products, but they seem to either worsen my condition or do not work at all for me. also i'v tryd to maintain a proper daily routine , But even a single all-nighter gets me back to my hair problems. PLEASE HELP ME FIGURE OUT THE REASON & A REMEDIE.