I agree with everything LITB said (amp on 11 for the part about fear controlling you right now) and would like to add that your H has asked for space and you need to dig deep and give it to him.
Familiarize yourself with Sandi's 37 Rules. Focus on you and how you can be the best HBW possible.
DBing is first and foremost about ensuring that you come out of this in the best shape possible, no matter the outcome. The residual benefit could be that you end up saving your marriage.
It sounds like your H could be depressed. You will have every urge to save him, but you need to let go as it's his journey to take.
There is a wealth of information and caring from both the veterans and folks who've only been around a short while.
Read lots. Post often. Figure out your role in the breakdown of the marriage and 180 those things, and GAL in a way that makes you feel healthy and good about yourself.
me 45 H 46 T 5 M 2.5 BD Sept 6 2011 OW Sept 8 2011 Threw him out Sept 8 2011