How Can ADHD And Depression Be Treated?

my 16 year old has trouble staying focused. Seems like 50% of the time he has a blank stare. He has been a victim of his narcissistic mother yelling at him and lying to him. He used to be fired up, although school wasn t stellar. He is defiantly depressed as I from being with a toxic mother/ wife. Everything we do is wrong and we get a rage. Doctors seem to think he has ADD. He diefinatly is not an interrupter, or bouncing of the walls. It is just the opposite, he stares and cannot carry a conversation because he zones out and does not know what we were just talking about. Prozac, wellbutrin, aderall and concerta we have tried. Nonething seems to change. Currently he is on no meds and failing school. His mother and I are going through a divorce. Could there be something else going on because of that 100 yard stare?