Welcome Hap, I feel like I'm in a similar boat that you are, as my WAW has been pressuring me for the D since dropping the bomb. I would say only be so supportive, just listen. I would say to continue to keep your distance and give him some space. Also, continue to work on yourself. I have been doing that a lot and it really seems to improve my mental health.
As far as living in fear about the papers arriving earlier (although that appears to be in neutral right now), my DB coach said fear is a great motivator but a terrible guide. Someone else on this forum told me that the papers are step 2 out of 100. With that being said, my W went to see a lawyer this week about a dissolution and came back with a big stack of papers to fill out, so I am trying take the previous sentence to heart right now.