Swimming is a good idea, after that, try the movie, or art (or both). Take the dogs out for a walk. Just breathe. You can make it through the weekend. Go to the oa meeting, and if it helps, go to the aa also.
As teal and granite pointed out, sometimes responses are not appropriate through email (or even the phone). She also might want more time to talk about the things in your letter.
You can do this.