I went to a salon in town and had my really dark brown with hints of red stripped out with a bleach bath, then a chestnut brown applied a blonde highlights in a t section, my hair is now very porous with breakage, completely ruined. I hate it so much. For the last 9 weeks I've been treating it with all different products. I just want to dye it back to a dark brown and give it some shine back. Can you help. Will this damage my hair more.

No!
It might get more unhealthy

Intensive conditioning treatment and regular trims would be much more helpful.
Introducing more chemical treatment at this point will only do more damage.