I just wish I didn't give up on him and was actually there for him as a friend or maybe even something more. I would've helped him get his sleep without those quacks poisoning his system because he'd have a shoulder to cry out his worries on, a friend he could rely on, and if being too full of energy after rehearsals was what was keeping him awake also I'm sure I could think of ways to disperse that energy for him.
As for his other problems I dunno if I could've helped there. It seems he lived his life in intense physical pain since his back injury. Perhaps we could've worked together to find safer and less addictive alternatives and ways in which he could reduce the strain that was causing his back to hurt all the time and perhaps even some regular theraputic massages since I did practice massaging at one time and used to give my neighbour and my mother a regular back and foot massage and they said it worked wonders for them.
