wow. that is quite a story. i am relatively new to this site and i'm sure those who have been around longer will have much more solid advice, but my first suggestion would be to set up some boundaries with your husband...all this in and out and staying with you and staying with him mom and back and forth is enough to make ANYONE depressed. it's not helping you and it's certainly not helping him. but he shouldn't be free to stay or go as he pleases...read the thread on boundaries and re-read the chapter in divorce remedy about setting up your goals and then working towards them.
i also would advice that you not let him come in, sleep with you, be intimate with you, only to leave again the next day or a few days later. that just lets him know that you are always available to him whenever he needs it and he should know that is NOT the case.
read other people's threads, too...there is so much insightful advice here, you'll wonder how you ever functioned without it!
Me30 H29 M2.5 T5 H moved out 1/23/2010 H wants signed agreement 3/30/2010 ...feeling hopeless