T.N.
I have this same problem in the winter. I recently was looking for similar answers because I wanted to stop using head & shoulders - I wanted something with less chemcials. Someone told me to try tea tree oil and it works really well. I mixed about 1/2 cup water with a few drops of tea tree oil and massaged it into my scalp in the shower. Let it set for a few minutes before rinsing it off. For spot treatments, I have a small container of that same mix and I just dip a cotton ball in it and rub it around on my scalp. You can leave it on. Tea Tree Oil is available at places like GNC.
good luck!