Re: How i screwed everything up.
TRF, you're likely to be on something of an emotional roller coaster for a while. You need help, and seem to be reaching out for it.
1. If you feel like you can't take anymore, call your therapist. Immediately.
2. Have a buddy you trust on standby who will let you vent (verbally) when you need to.
3. Add short term, positive things to your life.
Volunteer at your daughter's school.
Volunteer at a local community event
Take a friend on a nature hike, canoeing, fishing
Things that will get you away from your situation for a few hours.
4. Does you community college have a baseball team? Try to catch a game once a week. Keep score. Teach your daughter to keep score, if she's interested.
5. Check the course listings for summer session. Any classes look interesting to you? Sign up. Audit if you don't want the stress of tests and papers and such. Personally, I think the arts, humanities and pure science are the best options. Maybe a foreign language or PE. You could take up fencing, rowing, or another sport you've never tried, if they're offered.
6. Catch the local or nearby outdoor music festivals. Even if it's not your favorite kind of music.
Longer term? Plant a garden. Take a class or two. Join a book club. Learn to play a musical instrument. Take up a new sport or physical activity. Preferably one you do with others.
None of these activities will solve your problems, but you don't have to do that all at once. Like you said, one day at a time. I'm only trying to offer ideas that will help you to keep looking forward rather than back ... controlling the things you can control.
Take care. And remember rule #1.