In the end it really came down to acceptance. Accepting what I couldn't change, taking the situation for what it was and maybe even trying to learn something from it, and freeing myself to put my energy into things I actually could control: being positive, being grateful for the good in my life, and appreciating the love that was all around me.
First and foremost, do not believe that your Inner Worrier is the voice of truth. It's simply the voice of fear. Secondly, know that stress is an inevitable part of living life. Work with it, find your way to getting yourself in the driver's seat rather than allowing the worry and doubt to steer your vehicle.