I think writing and journaling really help to sort out things.
Why did you stop exercising? Did something change? Why did you stop eating well and start eating badly? Could it be depression? Anger?
Forgive yourself because you can't do anything about it now and move forward. Get back to exercising. Make an exercise plan for today and the week ahead and try to stick to it. If you can't, then identify why and try something different next week. If you do it then congratulate yourself and try to do it for another week.
Once you are back to exercising, you will probably feel better about yourself and you will be naturally able to eat better.
Just take baby steps right now to get back on track and stay positive. You are still ahead of the game and this fall will help you in the future as you try to keep the weight off.