I'm having an allergic reaction to something and it causes my head to itch and flake so I need to start using dandruff shampoo...will head and shoulders clinical strength shampoo fade my hair color and make it lighter? My hair was blonde but I dyed it dark brown and I really don't want to lose my color! Can I use the shampoo and then a color care conditioner to save my color? Please help! I really don't want to have to dye my hair again!