I have used T-Gel shampoo before and found it to be very harsh. If you suffer from dry scallp, it is probably not a good choice. I would try a shampoo that moisturizes. And, I would use a conditioner. Does Head and Shoulders have a version with conditioners?

Is your hair long or short? Is it color treated? Do you shampoo everyday? Do you use a blow dryer (this can dry out your hair and scalp big time)?