Will a toner ruin my over-processed hair?

About 2 weeks ago, I bleached my hair from a dark brown. Parts of it turned orange and other parts did what I wanted. I decided to try a different bleach and leave it in longer until it was the color I wanted. I did that, but now it is gummy and kinda bright. I know gummy means damaged beyond repair, but a friend told me to put a toner to help the brightness. Will a toner damage my hair worse? Should I just do choleserol treatments for a while and leave it alone? Is it true that a protein filler might help with the gumminess? I am not a hair dresser, but I am skilled at this. I also can't afford to go to a hair dresser. They usually don't do what I want anyway. I only buy products from Sally, so they are professional grade.