I've done something very similar to you, The Scientist. I was abusing my hair with hair color, the straightneing iron, harsh shampoos daily, etc. until I found this site. I took better care of my hair and then used henna to try to repair the damage and my hair reacted very badly to it so I cut off most of the length and have been trying to grow it out since. I haven't dyed mt hair at all for the last year. I still have a few inches of damage(which happens to be red while the rest of my hair is my natural dark hair color so it's very obvious) but I've just been gradually trimming my hair every few months so I can still gain some length. Anyways, I wish you luck with your growing out journey!