I understand Cluckadoodledoo75.
I'm going to be in a very similar situation myself possibly next year, maybe later than that, but it's coming. It keeps me up at night worrying. My DD will be going to Uni and my DS's father has an alcohol problem and lives with his mother who pays all their bills and enables him. She is ill and when she goes, he will no doubt try to get DS to live with him because he'll want the child credits as his money won't pay his bills and his drink. He's really controlling and phones multiple times a day to 'make sure' I've got him to school, he's done homework, he's not allowed a phone etc.
People suggest food banks selling on ebay etc, and whilst they mean well, those are short term not a solution.
I know what you mean about landlords. Mine sold up and despite trying so many places and a guarantor, no one would rent to me. Someone else ended up buying it with us in situ but it was awful.
I also have severe anxiety caused by PTSD and it is so hard.
I'm so sorry you are in this situation. The only things I can think of that may help is applying for social housing, and also maybe doing some cash in hand work.
I applied for social housing thinking I'd wait years, but I got somewhere within weeks. It is an older property and at first the area worried me, but it's been absolutely fine and I love it. My rent has halved and it's now manageable on my wage (30 hours at minimum wage). I'll still have big issues when the DC come off my claim, but at least now I can hopefully cover it by taking on more hours. Is that something you could look into?
Also Open University has online degree courses you can do. I think they are free if you are on a low income and don't already have a degree.
I think the solution for you are long term. I know it's difficult to see the wood for the trees when you are so stressed in the present (been there, still very much there), but try to take steps.
Please don't harm yourself. It's your situation, not you. You have worth. I bet you are a great mum too to raise DC who are going to college and uni.