Hi,
It's natural to feel stressed at this stage, don't you think? Doesn't mean it's OK. You still want to lower the stress, but it doesn't mean you're not up to the work.
Can you ditch stress related to anything that doesn't matter? you really don't need to get on with other people at uni. You only have a few contact hours with them a week. Soon they will be out of your life for good if you choose. But your degree won't be. Finishing it will be something you can be proud of and use to your professional advantage for the rest of your life. You don 't need to spend energy on befriending them or wondering what they think of you. That doesn't matter. Ditch that load.
Can you try to eat small amounts of healthy food that is easy to digest? Soup or chicken, or even carrot cake which has nuts, veg and cream cheese in it. It's hard to eat well when you're stressed but not eating can leave you so run down. Maybe drink protein shakes and smoothies if you really can't face food. (I remember that feeling from finals. Lived on milky coffee and survived.)
As to the work load, can you break it down into small, manageable stages? if you can't, because of stress, can you ask a tutor to help you do this? Is there an RLF fellow at the uni who helps with essays and writing style? Do you have access to counselling at uni?
Also, it can help to imagine how you'd cope with a worst case scenario, and what that would mean to you ten years down the line. Even if you drop out, you'll still be standing, still have your DC, still have the chance to make the best of your life and achieve lots of other things. So, given that it's not life and death, there's no harm in having a go at finishing it and seeing what happens. If you scrape a pass, you still pass! A dissertation that you think is rubbish might still pass.
And if a student exists, with a child, who is doing finals and whose house isn't a tip and who doesn't feel stressed, I've never met them. You sound like you can cope. It's tough but you are managing and will probably continue to manage until it's over. I hope so. You'll be glad you did.