Dry Hair Blues

The last time I had my locks maintained I decided to lighten the color of my hair. Nohing major, I just went a few shade lighter for a summer-y look. Well its been about 6 weeks since the color and my hair has been incredibly dry and blah! My scalp has also been quite itchy. I must confess that I don't wash my hair that often. I can usually go 3 -4 weeks without shampooing (Gasp!!) I know that sounds real bad, but my hair tends to thrive without too much washing. I spritz with my ACV and Tea Tree oil concoction and I'm good to go.
Any how, since I got this color job, I have to re-think my routine before I lose my hair.