It is good to go outside -- I don't know if it matters what time you go out. And great on keeping a diary, because you NEED therapy. You need to have your doctor refer you to a good therapist and keeping a diary will help him treat you. He'll know how you've been feeling before you saw him. so that's a good idea.
I hope you have insurance that will cover it because you really should see a therapist. I wish you the very best. Please take care and let us know how you do. God bless and take care. Hugs, Lee