I found that even if I hang on to unhappiness as hard as I can .... I can't sustain that state forever. Happy moments will come and my job is not to ignore those little moments.
Sometimes it feels like forever, but that is really an illusion. When I notice just a touch of a good feeling, I begin to open up and see it is more often than I think. Of course feeling bad will happen too. I just need to remember that none of the feelings is forever.