PG,
Numb is actually a good place to be for a bit. I was there for a while after difficult child moved out. It was weird but it was safe. No one could hurt me because I was just going through the motions and making things happen as best as I could.
Check with your insurance about the guardianship thing. I know that in the military if you have temporary custody of less than 1 year the child can NOT be put on your insurance. If you get custody for 1 year or longer then you can add them to your insurance. It's basically a way to keep parents from adding their childs child to their insurance temporarily.
Still sending hugs!