mrsv I am so sorry to read your news, that must be heartbreaking on so many levels. I can't imagine what you are going through but everyone is right, you will be ok as will Henry, much as that seems an impossibility right now. It does sound like he might be depressed (describing himself as 'drained' etc) and I hope you manage to get some marital counselling before giving up on your marriage altogether. I know family mediation is incredibly helpful and at the least can prevent acrimonious divorces, at best, the process can keep a family together.
Lucy is now four weeks old and still v unsettled in the evenings, but two nights ago we had a random breakthrough of 8 hours sleep in a row...(8pm-4am)... It was random though as last night she was pretty awful. Seems v windy and she cries a lot now in the day when she is awake. I just took her and the dog for a walk and ended upnpushing buggy up a very non buggy route, crossing two rivers and ending up on top of a big hill with most rolling down from above. V dramatic and I thought I was going to get lost, but felt great after, full of endorphins. 
And as for wanky husbands, mine came home the other day after work and picked dd up as she was fussing and I told him off for throwing his coat,keys,laptop etc all over the kitchen table and he replied 'well, I have been looking after your daughter!' Er, your daughter too Mr!! I was not impressed. Men.