Stare out the window and look for hot chicks.
If this is caused by a chemical imbalance in his brain, then surely this isn't an example of his brain playing tricks on itself. Maybe his mind is functioning normally for it's.....structure (?).
That's cool. Just try to be open-minded.
Remember on a basic level, both your depression and anxiety are just tricks your mind is playing on itself because of the way it is structured and the chemical balances inside.
If this is caused by a chemical imbalance in his brain, then surely this isn't an example of his brain playing tricks on itself. Maybe his mind is functioning normally for it's.....structure (?).