I need help

I realized a couple years ago that I was a hoarder. But instead of starting to fix it then, I pushed down the shame and it got worse. I have always had a messy house but I have not always been a hoarder to this level. I used to be able to set out an hour and clean my apartment. Even just last year, I look at pictures and my house was in better condition than it is now. Last year I had a really hard pregnancy, became a single mom to 3 kids, had a lot of traumatic relationship issues. Now my ex is threatening to take me to court saying he’s taken pictures of the state of my home. He’s here everyday to help with the kids which has made my life harder because I can’t be around him, I just lay in bed all day while he’s with the kids. He brings me the baby to breastfeed and takes him again after. I don’t know how to fix this. I don’t know how to throw things away. I can’t get over the guilt of throwing things away. I feel these things could be useful me one day or another person and so I feel too guilty to throw it away. I also have ADHD and struggle to know where to start with tasks and cleaning. My oldest kids (6&8) are becoming hoarders too. Any time my home has been clean I feel so much better but I can’t keep it that way because I have too much stuff that it’s just unmanageable.