doggie, just run out and bite someone on the bum.

or,..maybe a better idea,..
you could run out and buy a copy of "The Power of Now" by Eckhart Tolle.
Available as a softcover book for about $25 or as a cd set for about $80.
The cd set (7 cd's) is worth it because you are more likely to listen to it over and over whereas with a book, you tend to just read once and forget it.
ANd you really do need to read or hear this stuff many times over so that it changes your natural way of thinking.
The basic message is that people tend to store up everything that ever went wrong in their life and continually replay it over and over rather than just live in the present moment and deal with the immediate situation.
Most of the stuff that depresses people is stuff that has already happened so you can't change it.
Once you have considered it, analysed what went wrong (or right) and taken lessons from it for the future, it's pointless dwelling on it any further.
What's done is finished with. Live in the present moment.
The other thing that depresses people is that they stress about future events too much. What if this, what if that,. most of which is wasted stress because of the many possibilities you stress about, at the most only one of them will be correct, and maybe none of them will be. So why stress about all of them?
So again, consider the future ocasionally when you are feeling up to it but then put that to one side and live in the present.
It's not easy because the mind is like a dog off the leash and continually chases after the worst posssibilities and dwells on those. It's wasted stress because you are ruining the present moment which is probably quite acceptable by dragging some other imagined event into the present, which probably wont occur anyway.
There's lots of other stuff in this book that can be of use in just keeping life in perspective.
And don't say that you cant afford $25 cos I wont believe you.