If you do not have the skills necessary, find yourself a mentor who can guide you.
When you can't stop thinking about the same problem, over and over again, and you keep thinking about the past, you are ruminating; you're engaging in an inefficient mental exercise. Let these negative thoughts pass. Instead, focus on what you can do now. Live in the moment, not in your mind.
Pointless meetings don't just waste time and money, they kill enthusiasm and productivity.