I've been having an itchy scalp for about a week now. i'm going to try using itchy scalp shampoo, but what other remedies should i try using?

Shampoo first: Try the shampoo for a week at least and then see how you are doing. Most dry scalp from winter will improve.

Identify the cause: You may want to have your doctor examine your scalp if it's not relieved by dandruff shampoos, or stopping something that's irritated your scalp a week ago. There might be something there that you can't see, in which better choice of treatment may be offered, especially if it might be inflammatory, infectious, or something else. Visual inspection is the best.