I think it's normal to feel overwhelmed when serious marital issues arise. There's so much to process and you receive a lot of advice that often seems conflicting; it's hard to figure out which way to go.
From my experience, focusing on my GAL activities did the most to help me get through the bad stuff. Most of my activities revolved around home improvement projects, but that exposed me to a lot of people along the way. (Many of the local Lowe's and Home Depot employees know me by name.) I did more home improvement projects in the past four months than I'd done in the past five years. I was on fire and it made a huge difference because I had things to focus on and I was worn-out at the end of the day. When I went to bed, I was exhausted and I'd usually fall asleep immediately. And actually, it was a very happy time for me; I could see the house looking better and better and I was able to be creative. It was a wonderful mix of productivity and creative release.
So, what I'm saying is, you're on target with the GAL stuff. Find activities that occupy your mind and keep you busy and you'll be able to weather the storm.