I think what you're feeling is normal. Fear of the unknown, knowing that something has changed and more change is to come. The realization that your life seems to be heading in a new direction. And maybe you also have some fear as to how you think your AH may react if you really do decide to file for divorce. You're bound to feel nervous, scared, jittery, etc. You have a lot of emotions swirling around in your body.
Just hang on, you'll do fine.