Hi
As a Relationship Coach I'd like to start by saying you are by no means alone in this sticky situation. A lot of couples / one half of a couple can find it really difficult to talk about money and it can create all sorts of issues. I have frequently seen couples who in every other respect are brilliant and communicate well but are hopeless at discussing anything to do with Finances and it can become a 'no go' area.
And often couples have very different approaches to money, both between them and compared to other couples. And there is absolutely no right and wrong. If your set up generally works well, and suits you both, or has worked well in the past then it's totally fine. Funnily enough I wrote a mini blog about it on my Facebook page recently as it crops up so often (I can't figure out how to link to the specific post but the page is
www.facebook.com/thecouplescoach and it's a couple of posts down - I regularly post top tips to do with relationships / life incase it's of interest).
Clearly at the moment your system has had a bit of a hiccup. And it may be that you just need to have a chat about what to do with unexpected items that are not just ongoing regular bills. Also to make sure that it feels fair for both of you.
Perhaps it also feels difficult to have a conversation like that because you feel you will be criticised. As a side note here the 'jokes' about you being crap with money are only really jokes if they land with you like that, otherwise it can be quite demeaning and is a way of putting a partner down. Or possibly your relationship has developed some less than helpful communication patterns and perhaps you don't feel you can be fully open in general? Again a very common situation with longer term couples that can be easily remedied by talking about it and both agreeing how you want your communication to be.
I would suggest having the discussion as soon as possible because it's not going to get any better. And start by being honest that you find it hard to talk about, please don't criticise me but I need some help here etc etc. You know your Husband best. Hopefully as part of that you can design together how to stop finances spiralling out of control in the future.
Good luck and I hope it goes well,
Sue X
www.thecouplescoach.co.uk