Have you done everything that you really can to resolve your problem or change the situation that you are currently in?  If you are not not getting the results that you want, and you are tempted to start complaining, stop!  Ask yourself an honest question "have I truly done EVERYTHING that I can to make a difference?".  If the answer is no, then decide what you have not yet done, the doing of which, will make a difference.  Is there one more phone call that you need to make that you have been putting off?  Do you need some more information?  Could you enlist the help of somebody who may have experienced what you are trying to do?  What if you tried a different approach, even if you are sceptical about the potential outcome or success of your appraoch?  What do you have to lose?  If you don't take action, what what will you lose?  What won't happen if you do this?  What will happen if you take action?  When NOW would be a great time to do this?

If you are able to satisfy yourself that you have truly taken every conceivable course of aciton, have pursued every avenue and have done everythig you can think of, then step back and let-go for a while.  If you have truly done everything that you can, then the rest is left to fate and there is no longer anything you can do.  Take satisfaction in knowing that you have given this your very best shot and move onto something else that is worthy of your attention.  Create a few degrees of separation by immersing yourself into something new.  What else could you do?