I believe happiness is psychological. We all encounter difficulties in our lives and surely we often feel down, sad and angry. For me, when this time comes I always think that everything happens for a reason. And what I'll do is do what I can. I mean, yeah this thing happen to me, but I won't make it even worse by thinking more negative about it. It "happened" it's a past now, what's important is what you can do at the present. You can choose to make a positive thought of it  and surrender the negative vibes! The moment you let go of the negative energy that's when you feel lighter, refreshed and ready for another challenge! And that's how I make myself happy :)