Use my supermarket.com
You do an internet shop as normal but it will tell you where you can save money by buying a different brand or shopping at a different supermarket.
Check your benefits - are you getting carer's allowance? If you are not then claim it.
Check your tax situation, when did wither of you last work? You may be due some tax back.
Check what tax credits you would get if you do go back to work, it might be more than you think.
Babysitting? If your husband is able to cope with your children in the evening (sorry no idea of what type of disability and how many children etc) I babysat for extra money many years ago, lots of people would prefer not to have a teenager babysitting. Ask around parents of your children's friends.
Depending on your husband's old job you could look in to grant making trusts and see if he is able to claim any pension / payments.
www.dsc.org.uk/publication/the-directory-of-grant-making-trusts-201617/
The book version is available in libraries, I got quite a bit of funding as a student from various trusts because I had become disabled. It takes time to work through, I did a spreadsheet and spent the first 2 weeks of the summer break applying - I got one for being born in Yorkshire, and another for being a 'lady in impoverished circumstances training to better herself'.
Lots of trusts were set up by Victorian philanthropists so the language can be quite amusing, one was for 'the impotents of the parish of...'
If either of you are in a union, or if your dh was before he stopped work they can often help with advice and sometimes finance.
Do you have credit cards? They can suspend interest for a time, some are better than others.
Check your bank accounts, sometimes you can get cash for swapping, although a lot need you to have a minimum being paid in each month.
Have you got 'warm homes discount'? You have missed it for this year but as you have a disabled adult in your house it looks like you would qualify for next year - it is £140 cred to your electricity account (even if you are on a pre paid meter). The money is allocated on a first come first served basis and each company has its own rules - link for British Gas below
www.britishgas.co.uk/products-and-services/gas-and-electricity/the-warm-home-discount.html
Are you eligible for any free courses at your local FE college? If so you can get a student ID which gives you 10% off in loads of places.