Listen , I wish you all the best, OP, but you need to look at what you are saying.
The original IVF was not on credit, etc.
OK, you paid upfront for the IVF.
BUT you simultaneously had debt that you were already servicing.
SO therefore it doesn't really matter if the IVF was "not on credit" - you were already in debt.
Same-same for anything at all that you spent on whilst in debt to the tune of £X,000 over the last few years. It doesn't really matter where that money came from to pay things - the fact is you were in debt to the tune of £X,000 AS A COUPLE and bought other stuff before prioritising paying off the debt.
Not kicking you when you're down, I assure you. Just think that if you ever want to get out of this hole, you need to see the bigger picture.
Your net worth as a couple has been extremely negative for a few years now.
To get it positive again, you need to accept that pretty much ALL the decisions you made financially in the last couple of years were not great.
Your DH withholding information was shitty. But at a guess he knew just how much being a mother meant to you and he tried to give you what you wanted despite everything.
Be kind to both yourselves, but be honest too about exactly how you BOTH got into this.
. Good luck!