Your MIL sounds like a good person--she confirmed that you should continue to DB. Let it roll off of your back. And work on getting yourself as knowledgable and prepared as you can, if he does decide to "bolt" for a while.
Hang in there....I wish I could be more help...it is so hard to sit back and do nothing, smile and pretend that all is well in your world. But that is really what you have to do--start by pretending, and it will lead you into really feeling it. Reread the DB/DR if you feel like you have to do something, then plan an activity that is just for you.
