I hear you about the depression, man. I known people who've dealt with it and, no joke, training became a lifesaver (literally, in one case). Lifting or breaking a sweat doing hard work 5-6 days a week is essential to staying out of the funk.
Think about starting a training log for accountability, feedback, motivation, and just to shoot the shit. Also, not to touch back on the strength thing but "strong for an injured guy" isn't really a measuring stick you want to keep referring back to. It's valid for now, but look forward, set goals, tackle goals, repeat.