Okay - so, what are you doing to GAL these days? And how are you going to make the most of the opportunity to spend time with your son? (Cuz even if you retain custody of him after the divorce, he'll be splitting his time between the two of you).
The best way to deal with your current situation is to focus on YOUR life. Set some goal to work towards that is fun and meaningful and will keep you from being overly focused on your sitch. (I trained to climb Mt. Whitney).