We've all been there before. I know I have. When I think like this I recall how good God is, and then I know that He does things; allows them to happen for a reason. Maybe we can't get that new job because there is something even better coming along at the present gig. Sometimes it requires patience, but it is essential to seeing God's plan.
Don't fret about the things you have no control over. It will just guarantee a big stressful headache where you should have peace. God wants the best for us all. Have faith and believe in Him who grants strength to the weak.