I agree with PP's--there's no way that this was the first notice. One time I zoned and missed a payment--the bank contacted me as soon as the payment was late (the 15th of the month, due on the first). They called AND sent a letter. I paid the late fee, but since I sent a payment right away, it never even hit my credit report. So, for the OP to say there has been no notice--that's simply not true. Perhaps SHE didn't see it, because her husband opened the notices, but there were probably several letters and many phone calls. Possibly emails, as well, assuming the mortgage was taken out in the time of emails (funny to think that, 20 years ago, emails were a new thing!).
The more immediate issue is getting some money together. Whether it's to pay the bank, or to eventually establish a new residence, the OP needs to buckle down and work on amassing $$. Sell things, take another job, get rid of cell phones, cable, a car, etc. You need a paradigm shift in your thinking.
Step 2 is getting more aware/involved in your finances. I understand having one person doing billing--in our house, it's me. But, the checkbook is available to DH at any time--he can always see our balance, write a check if needed, whatever. He has an ATM card, but generally doesn't carry a lot of cash, so he just takes from my wallet (letting me know, of course). My point is, he doesn't have to actually pay the bills to be aware of the family finances.
Step 3 is working on your marriage. Clearly, there's a disconnect here. Do you not have the money for the mortgage, or has your DH been spending the mortgage money on something else? What other "surprise" bills might there be, like credit cards that have been run up? What possessed him to think that not paying the mortgage--AND NOT TELLING YOU--would be okay? This is really the largest issue. I don't know if I could ever trust a guy who put his family in jeopardy in this manner.