you have to come back and make this game. again and again and again. I dealed with depression too, I'm still.My first experience with construct was so enjoying the first 2 weeks, I was addict to it. these 4 last years, I did nothing, unmotivated, huge lack of working, etc. But these days, I'm working all day long on games. I have 5 prototype, didn't finish anything but keep going, past through frustration while learning every days, but each day brings me something I've learned, even if I could'nt even fix the things I wanted to make it works.
this feeling you going through eats you and knock you down I know. Go make sports, that helps dealing with yourself. and go back to construct, even if you don't feel it. past throught. I know it's difficult, but go with what you got on your hand.
I count years too, that makes me frustrating too don't worry, you're not alone.