DS is 16 and just started on medication for depression. He's in lower 6th doing A levels. Well I say 'doing'. he's often there in body rather than in mind but at least he's going to school. He says he needs the structure nad gives him something to do. However he rarely does any study outside lessons, often doesn't feel like it. At home he just plays on his computer or goes and sits in bed watching TV shows on his Ipod. He has even stopped reading books as that requires brain power which he doesn't have - in the past he has been a voracious reader. He's also given up any activity he used to do such as scouting or reading or climbing) and isn't interested in doing anything. Oh and I get told off about my parenting style, eg not taking him to the Doctors sooner to get assessed (he didn't want to go).
I get that there are times he doesn't feel like doing anything but on his good days (which are few) I try and encourage him (without success) to try and do some course work - if only to keep his teachers on side with his illness. What I don't get is that on his good days he still won't try and do anything. He seems to take delight in NOT exercising, not eating anything healthy and not engaging with the world (he also has Aspergers and has been diagnosed with anxiety). he basically doesn't care about very much at all.
How can I support and encourage him to do something other than his gaming, a bit of study etc? I'm sure we have an element of teenage rebellion meets mental health issues just to complicate matters. Any experience, suggestions of tactics that have worked would be greatly appreciated