You should be very proud of your son! You know what they say, "the apple doesn't fall far from the tree." I know you will miss him when he's gone. It sounds like he has a lot of excitement in store. I'm glad you two are getting to spend some time together.
I completely understand the feelings you are having of wanting to drop the rope; it was just a few days ago I posted that I was ready to be a runaway-as-fast-as-I-can wife. The sadness, anger, disinterest, etc certainly comes and goes. But you are on the right track of thinking with wanting to do a little GAL'ing. You are focusing on YOU. Just take one day at a time and keep your heart and mind open. You're doing a great job so far. Just remember...it's a marathon, not a sprint.