I recommend starting with conversation.
If you love him with all your heart, TELL HIM! Tell him that you still think he's a neat guy, you still want to be with him, and that your marriage is worth fighting to save. Tell him you don't know what you will do with yourself if you have to move out and that you would rather stay in your house with him.
Sit there and tell him every good thing about him that you can think of. Tell him that you like to think you're pretty smart, and that losing someone with all the good qualities he has would be stupid.
Then kiss him, tell him you completely believe that you two can make it through these difficult times, and drag him into the bedroom and screw his brains out.
That should take care of things in the short term
Longer term, it sounds like you could benefit from some counseling to address any ongoing problems with respect to the terrible loss you suffered. Your husband could probably stand some counseling as well to help him work through his grief, but guys can be resistant to that approach. You might also consult with a Doctor regarding your husband, for an evaluation of whether or not your husband is clinically depressed, which may require medical assistance to overcome.
It sounds like you two have a very salvageable marriage- it seems like you're both just going through a rough patch, rather than facing problems that can't be fixed.