I'd like to add that depression and anxiety can get so bad that there actually painful. Its hard to describe to someone who has not experienced it. After a long enough time you can forget what its like to not be depressed and anxious. They can be a life preserver that lets you stop treading water long enough to catch your breath long enough so you don't drown.
They might be overpersribed. If it helps people who are loosing the fight i say perscribe away.