You don't know me any more than I know you, but let it be said that I am pretty much a giant dickhole a lot of the time and that I very, very rarely say something that's untrue just because it would be kind. I'm much more likely to say something unkind just because it's funny. And true. Or whatever.
ANYWAY, that rambling is to preface that I listened to Sunshine and I actually really enjoyed it! It's got a much-more-poppy Velvet Underground sort of vibe that I really think you could work with pretty well. It's probably a bit much to make a direct comparison, of course, since they were a world-changing band of epic proportions, but it really sounds like it's in that vein and I can honestly see you doing quite well if the right label got a chance to listen to that track.
I'll definitely be listening to the other songs when I get a chance, and I might even spend IRL dollars on a copy of Sunshine.
Well, an IRL dollar. But STILL. :P
And since it was more of a theme of your post than the music; don't kill yourself. Just don't. You're better than that, quite frankly. You're capable of creating some pretty decent art here, and it'd be a shame to lose that. And you're ****ing 24, man. You're barely past the kid stage. Think of it this way; you've been an adult for 1/3rd the time that you spent being a kid. There's still plenty of time for you to hit a point where you're able to feed yourself by playing music, and it's a long, long time away from when you ought to give up. Just keep talking to professionals when you can and maybe try some other drugs. They make a whole lot of them, and surely one of them has to be compatible with song-writing. :P