Typically when you over-think and obsess about something, it never leads to a positive outcome. Over-thinking brings out anything and everything negative. When this happens you begin to believe all the negative aspects of the situation and things can quickly spiral out of control. You jump to conclusions and take action based on the negative perspective, and many times these actions lead down a path that is very hard to be undone. Taking actions that are totally off base can make it very hard to stop, put it in reverse, and get back to where you started. You can get so far to one side of the equation that you can't even see the other side any longer.
Sometimes you have to realize you are over-thinking and obsessing and take a step back. You have to try to take the emotion out of the situation, the best you can anyway, look at it with an open mind and be as logical as possible. Trust me when I say that I know this is easier said than done. It can be nearly impossible to take the emotion and your true feelings out of consideration in order to get a more clear picture. Yet, many times things are completely outside of your control and nothing you do will have a positive influence.
The most difficult thing to do many times is...nothing. But doing nothing can be the best course of action. The best action could be in-action. Sometimes you just have to believe that things will work out the way they are supposed to be. That anything you do or any action you take could make things worse. Sometimes you just have to take a step back....breathe....and have a little faith. The answer and outcome may not always be what you want or had hoped, but it will be the outcome that is meant to be. You have to believe that there is a master plan leading you down this road to where you are supposed to be, as difficult as that may be.