Dude,

I know it must be blazing in Reno this summer, but sunshine, fresh air and a little sweat always makes me feel better.
I've had some really bad days myself since being back from Iraq, but like Zues said you just gotta snap out of it.

I don't know how long you've been feeling lke this, but I think a lot of people go through it and some for long periods of time.
I think people go through stages where they wonder/worry about their future (getting older/finances/careers), etc. and it's a lot to process.
That's brave and healthy of you to post these types of feelings up here, but that's what you need to do is let it out somewhere.

Good luck man,

Cy