Why don't you visit divorcenet.com and read up on your states divorce laws.
The whole MIL thing kills me. What are they going to say that is going to make you change your mind.
Well I hope one day your H does wake up before it's too late or he will be the next new person posting on this site looking for advice!
Hang in there. Just remember that change takes time and also change sometimes happens slowly. So look for little signs not just a complete overhaul. And, if you see them acknowledge them and maybe he will be determined to change even more.