Remind yourself that you are just on your Hero's Journey and you have fought and won many previous battles so you will win this battle as well!
One great thing to do is to focus on what you can control today! What can you do right now today to make it a good day. Be strong today and focus on the positive. Remember... what you focus on you expand so let go of focusing on future problems, worries about tomorrow, and fears that may never come to pass because you will only be expanding these things.
Finally, know that you have a friend in me and a friend in yourself so you are NOT alone!!! Hugs!