When you can't control your life...
As I've stressed in other posts, life is less about what happens to you than what you do with what happens to you.
Approach the problem with as much faith and positivity as you can possibly muster. Try to arrive at ways to tackle the problem piecemeal; taking small steps is more effective than doing things on a whim.
Breathe slowly and remain patient. Recognize that Rome wasn't built in a day -- it might take some time for things to turn in your favor.
Whatever it is you're going through, resist the temptation to blame yourself. There's no use beating yourself up over things you can't control. "Buts" and "could haves" will get you no closer to resolving the issue.
Be forward-looking. Work toward achieving the outcome you want. Focus on the future and how great it will feel once you overcome this obstacle life has thrown your way -- as you've done in the past.
Anything is possible when you believe in yourself and maintain the will to persevere.