I am sorry to read about your problem. Having said that, I have to say that since you were taking drugs with basically unknown quantities it is unlikely any Doctors would be able to pinpoint exact damage. It is well known in Neuro circles such as this forum that when Doctors have no idea what the problem is they tend to say the problem is psychiatric. --- all in the mind.
There is one thing that I am personally sure about and that is that further drugs will not correct existing drug damage. It will take courage to be completely drug-free.
A further point worth a mention. Although you are being taken apart within, Doctors will not be able to really understand, since most drug induced abnormalities are subclinical. This means that there are no signs medically that the Doctor will be able to see. This fact can possibly explain why neuro problems are so frustrating for the sufferer. No one can see or really understand just how ill you feel