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Thank you for your question.
It is very unlikely for antidepressants to have caused permanent chemical imbalances in your brain.
So I do not think that is a possibility in your case i.e. drugs causing permanent chemical changes.
At times, we do get patients who are resistant to all kinds of medications for depression among other mental illnesses.
One therapy that is sometimes considered for treatment resistant depression, which you may be well aware of, is electroconvulsive therapy.
This option should be tried paritcularly if your depression is severe.
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Memory problems can happen due to medications i.e. benzos that you did take. So I agree with that.
Other causes, that I am sure must have been considered include low vitamin B12, thyroid problems, getting MRI of the brain done to rule out tiny infarcts in the brain among other causes.
Modafinil is actually a very good option for people who feel sleep.
So it is certainly something that can be used in your case to make you more alert.