For the last couple of years I have had dandruff that has been getting worse. It seems to be just at the front of my head and is getting embarrassing. I have used various dandruff shampoos - some work for a while then it just comes back. Is there a way of getting rid of it fast? I have a hair appt on Friday morning at one of the Hershesons blow dry bars in London and really want to have calmed it down a bit by then.