you poor thing. How very hard for you.
Did you notice how unhappy he was? Do you think the marriage couldbe changed so he is happier within it. I don't know what the problems are so cannot really judge it myself. Not that I'm the big expert on this kind of thing anyway.
I would definitely do the counselling and I think I might try and get a few counselling sessions on my own first to get myself clear if the aim is to definitely to work on saving the marriage.
Do you know where you may have gone wrong, how things deteriorated to such a degree for him or are you a bit mystified by the whole thing?
Problem is with people, in particular I think with men, that unless they are willing to give it a chance, it won't work. I think (once again no expert) but from my own limited experience I would say when men come to the point of saying it is over for them, they are generally at the point of no return.
Good luck with it all, so hope things sort themselves out for you.
How are your pregnancy symptoms now you've had the scan? Are you throwing up now finally ? Keep us posted, chin up, you'll come through it.