Drop the nizoral for now.It's making your situation worse for the time being. Hop on folligen, that is mainly what it is made for. In a month or two, try nizoral again. You need to get irritation under control before you will have true success.
You might want to try T/GEL Stubborn itch formula. It's like pouring a cold bucket of water on your head. That stuff feels so good.
oh by the way, at first your scalp will indeed sting with Folligen for about 10 minutes for the first week or two.