Have u ever had a work up at the doc? You could tell him your story, if you are comfortable. As I know brain scans can find brain issues that extant can leave behind.
Or you could see a therapist. They know amir about how those drugs deplete the brain and how long it can take to be "you" again if possible.
A good therapist won't judge you and should list in their qualifications "drug issues@ or whatever. You need someone who focuses on that and not, say, marriage counseling.
Good luck and keep us posted. Even though permanent things can happen, many times it can be a learned behaviour from the pills or just left over stuff. If u used for a while, you gotta expect that it's gonna take time for your body and brain to do all the repair needed.