Hi Sinead,
You know the good thing about your husband is that he realizes he has depression and can do something about it. There are millions of people who plod along daily and have no idea why they feel as bad as they do. The second important thing to realize is that you are both suffering and not just him. You are suffering because you love him and anything that affects him, affects you and visa versa.
You have both been through a lot recently and it cannot be easy for either of you. Please don't go anywhere, but keep sharing your thoughts and feelings here to vent some of that hurt. The good thing is, we are impartial and it is quite private as noone really knows who you are.
Either way, you are sure to get answers and support from others with similar, less and far worse problems than yours, which can't be anything but a good thing.
I think the best thing is to not "try" but let nature take it's course and that way as you say, there is no pressure and strain on you both. Nature has a way of looking after us and for now you sound very strong. Remember it takes a long time to mourn a loss, but it is something that you must go through to come out at the other end. If you don't you will be stuck in the same miserable place for ever, and that simply can't happen.
Any time you want a good old chin wag or sniffle, you come here. There's always a

waiting.