I bet, truthfully, I probably have advice for everything, almost. But I think the one thing I have always tried to do is see the positive side of things.
It doesn't help to dwell on the negative things. And it can't hurt to instead "dwell" on the plus side. When you try to see the good that can come out of a situation, I'm sure you can't help but smile in the end. And smiling is good for you! Plus, it's contagious.
The grass isn't always greener on the other side. Look for the green on your side of the fence first, then you'll feel blessed with what you already have.
Be positive! (It's my blood type, I can't help it!)