I think some people just treat all threads as though they're posted in Fight Club AIBU.
This is the RELATIONSHIPS board - generally supposed to be more supportive and less fucking unsympathetic.
Thoughts of how to support oneself will cover ALL areas - if one doesn't already have a job, then there is a process to go through to get one, and in the meantime there has to be some sort of financial support! If the husband is unwilling then there aren't many other options. Doesn't mean the OP is automatically looking to the state for support, just making sure she's got whatever cover she will need.
NYE IS a spectacularly shit time to be told everything is changing - of course there are others that are just as bad, but that doesn't diminish the fact that a supposedly-joyous occasion has just been trashed for the OP.
It does sound as though he's been working up to it for a while, and to be honest, NYE is definitely a better option (inasmuch as it could be) than, say, Christmas Eve/Day to drop the bomb.
Your DC will be ok eventually, largely depending on how you both handle it. I do get why you're so taken aback though - I'm guessing you thought you had the choice here, and now it's been removed from you, and it hurts. Because you were prepared to soldier on, and he's not.
Get to a solicitor for advice, get paperwork organised and work towards making this as painless as possible. You can do it, you know - once the shock of having your choice removed has worn off, you will probably agree that this was the best way forward for both of you.
Be aware that there may be another woman on the horizon - there often (not always!) is. And that will have an impact on how the finances go, so get a financial agreement within as short a time as possible, preferably the first 6 weeks, as after that the guilt he feels will start to wear off and he'll dig his heels in more.
Good luck - and see this as a new start for you as well. 