op sounds like you have only got some of the story from your DH.
Call your mortgage provider and take a mortgage holiday for a couple of months, this is quite common and should be easily arranged.
Meal plan for the next 2 weeks, look in your store cupboards, cut out all meat and booze. Shop accordingly.
Once all your utilities and insurances have been paid out, split the rest of the money by 5, take it out the bank, put each lot into an envelop marked WK1,2,3,4,5. Only spend what is in each envelop each week.
Buy cheap orange juice and make home made ice lollies as treats, make home made flap jacks with value porridge oats too.
Is there any extra work that your DH could pick up over the evenings or weekends? Maybe some work for friends or family?