Do you have conversations with thoughts in your head? Does it feel a bit like a tennis match sometimes with "yes, but...", "no, but..." thoughts flying around? Don't get caught up in thoughts like that. They're really not very helpful. Allow your mind to settle. It will clear on its own.
Sometimes the best thing you can do is not think, not wonder, not imagine, not obsess. Just breathe, and have faith that everything will work out for the best. For more quotes and inspirations: http://www.lifehack.org/289857/sometimes-the-best-thing-you-can-not-think?ref=ppt10