As for the itchy scalp, I *love* Eqyss --
We use Premier Shampoo because it is great for pH balancing and between Maxam's yeast kit and this shampoo, life has been grand. http://www.eqyss.com/premier_shampoo.asp
I would also recommend the MicroTek shampoo if you have something fungal going on -- it works really well for fungi, especially yeast. They have the Eqyss at most feed stores.