Hi momto2boys. Welcome to Psych Central. Sorry you are suffering with son's depression. You are not alone. That sounds difficult for you. Depression is not sadness but a lack of energy so that is very clearly what son is suffering from. You could talk to the psychiatrist and tell them the meds are not lifting your son's energy level. If the psychiatrist is unresponsive you may want to find one specializing in depression and or children.
One pathway you appear to be on is to have the help of a therapist and psych doc can help with talk and med therapies. Another part of the way can be support here at Psych Central, but that does not replace therapy, augment it.
Another part is lifestyle changes. This can include life style changes like yoga, exercise, diet, mindfulness or meditation, singing or chanting, walking or running. The problem is usually that the person just wants to isolate and sleep. Those are they symptoms of derpession, so talking to therapist (T) and psychiatrist is important.
Many people here at PC find they can share these feelings and what they are going through with the confidence that people go through similar things and can empathize. So many forums are offered as well as Chatrooms (after you have 5 posts or comments on others posts). Depression chat meets on Thursday night at 9pm EDT and Anxiety Friday at 8PM EDT . (if not in US or not in daylight savings time) This is a great way to meet people just as much as the forums.
You can also be an active member in other ways like supporting others in their questions, reading articles and posts
http://forums.psychcentral.com that are applicable to your area of concern.
Please feel free to private message me or any of the Community Liaisons by left clicking on the name in blue to the left of their post) for questions or just to share.