Wow...sorry about your situation.You are dealing with A LOT!
I just wonder if you really want a divorce or if you are just searching for some way to solve all the turmoil you are going through.
I definitely think your H needs some help for his mental issue but I know well that they first have to accept that there is a problem and then want to get the help.
I would recommend continuing to GAL and pursue your schooling. It really does help feel better about yourself.