There is no quick fix. But sometimes having an aim to work towards and a plan of how to get there can relieve some of stress. The first thing you need to do is accept there is no quick fix and that you will need to make some tough decisions about things.
My home seems to run a bit smoother when I stay on top of the laundry, so my suggestion would be to take a few days off work if you can and try to get this under control.
Tell DH that you are struggling and he has to start taking some of the load off you, so he can do his own laundry and ironing as a start.
Once your laundry is under control then do a big declutter, kitchen, bedroom, bathroom etc. If you don't need it or haven't used it, then get rid.
Think about using supermarket home delivery. I was sceptical, but now I use it, and I love it. Work out a couple of weeks orders, even if its easy cook ready meals, and just rotate.
Do what you can to relieve the stress for the next couple of months. Then once you can see a bit more clearly, then you will be in a position to take proper stock of your life, debts, marriage and decide what needs to be done.
You have taken the first step by asking for help.