Life does not owe you anything, because life has already given you everything.
Happiness is a choice, not a result. Nothing will make you happy until you choose to be happy.
You've done it before and you can do it now. See the positive possibilities. Redirect the substantial energy of your frustration and turn it into positive, effective, unstoppable determination.
Take your mind off the problems for a moment, and focus on the positive possibilities. Consider how very much you are able to do.