I second Muzna. Go to a salon to have it dyed to a darker shade, and make sure you use rich treatments for damaged coloured hair. Australian hair products are always good to use, as legally they have to include sun protection and other things in their hair care products, which in turn really nourishes the hair.
Also, if, by highlighting your hair, your hair has become
really damaged, this makes me think that your hair was slighty damaged (from heat styling use?) from before. I may be wrong, but just ensure your hair has regained its healthiness before opting for any other colour treatments, and go easy on the heat stylers !
