dear BBPR, thanks for joining the site, and I can feel so sorry for you as well as your husband, perhaps if I was in your situation I would have postponed the wedding day, but that's with NO criticism to you at all, just saying.
What so many people do is pretend or as we say 'put on a brave face' when we are with others, so they think or believe there is nothing wrong. so it has nothing to do with you, so please don't be upset by this, because I did it for so many years I can't even begin to think for how long.
I also want to mention that, and I will take myself as an example, that I couldn't bring myself to be happy with my then wife, yes sometimes I did put on a brave face but this quickly wore off, because depression does this to us, and I'm sure that he loves you, but most of the time we don't or can't say it.
From what you say he is in denial, because his belief is that he doesn't need any medication and doesn't need to see any one, but eventually he will break and realise that he does, and how long this takes, I don't know, but something will happen that will make him understand that he needs help, but this isn't helping you at the moment, and maybe you yourself should go and see your doctor before it escalates too much, plus you need support.
If you click under 'Resources' at the top of this page, you can order all the 'printed material' from BB, which is free and there is so much information on depression, living with someone in depression and much more, it's well worth contacting them, as I call it my Bible, and sorry to anyone if you are religious.
If you some of the pages lying around he may decide to read it, but I wouldn't leave the entire bible at the moment as he may decide to throw it out.
You have an enormous job, looking after kids, working, cooking , cleaning and trying to help your husband, so that's why I would like you to seek professional help, and they will have ideas on how to stimulate or look after your husband.
I would love to hear back from you. L Geoff. x
