Trying to go no shampoo— need help

hello, I’m trying to do the no shampoo method to help my hair naturally balance out with it’s own oils. I have been doing this for about 2-3 months now but i end up washing my hair about once every 2 weeks. This is because every time it gets to like a week/2 weeks in, my scalp gets extremely itchy and dry, but my hair is oily, and i sometimes get blemishes on the scalp under my hair. has this happened to anyone else? i’ve been using dry shampoo sometimes too so i wonder if that is the issue but even without it this happens.