When you have to worry about something that you do not have all the control over, what do you do? You ask these questions:
1. What is the worst that can happen in this situation?
2. Ask yourself, can you live with the worst situation?
3. What can you do to minimize the worst?
4. How can you act on minimizing the worst situation?
5. Ask yourself what could be the best scenario?
6. Can you live with the best scenario?
7. Ask yourself what is the most important thing in this case?
If the most important thing is met, worrying about it is pointless and ego driven.