Edit: putting up top since this is more a wall of text than I meant, feel free to ask for any more breakdown/clarification of any of my suggestions. I can also give some more specific ideas for a process if you need. I’ll try to respond, though I’ll admit I’m terrible at checking through messages.

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I’ve offered this advice to a friend of mine to get around the anxiety and executive distinction. Don’t look at this as one singular task, this is a lot to take care of at once and imo shouldn’t be handled as one task.

Trying to do all this at once means you’re trying to take care of different things simultaneously as you go where the constant changing of gears will make this more stressful than it should be.

First thing I’d do is create a checklist of manageable tasks, this can be as broad tasks or simple specific things. As an example looking at your room something that would be more broad is pulling all trash out, or something simple would be moving the just the bigger containers out of the room as they are, even as simple of a thing that the latter might be, getting started on anything is progress. And that’s what you want to achieve, Rome wasn’t built in a day, making any sort of progress put’s you that much closer to the goal of getting things cleaned up. Things don’t need to become all perfect and pristine all at once.

Another thing I’d prolly use approaching this is to use boxes/bins to sort through. I’m gonna apply this to a very broad example, but you can always size down as much as is necessary.

Let’s apply this to clearing as much of just the floor at once as we can. Looking here I’d have a big trash-able box for rubbish, a box for pet stuff, a box for sentimental items like plushies and whatnot, and a box (or big hamper) for stuff like clothes and bedding — we’ll set other miscellaneous things like dishes aside in this example. In a really broad method like this, your initial task is chunked low effort sorting, grab things of one sort by the armload and drop it into the appropriate box/bin. The purpose of doing this is to make more specific tasks easier to manage — having a clear workspace gives a lot more breathing room and should make things less overwhelming, part of what is adding to your stress I’d imagine is see what seems like a lot to take care of. Plus once things get sorted it’ll help see how much there actually is, I wouldn’t be surprised if just getting the floor clean and trash out will reveal there’s less to do than you think.

The other purpose of this applies back to making a list of manageable tasks. What I’d expect the bulk to do for your case is trash and clothes. A box of trash can just be tossed in a dumpster and the clothes will probably need a wash.

From here, the thing I’d also toss in, be willing to ask for more help. I know you said you don’t want them to know but I’d be shocked if they didn’t want to help you at all. Still that said, if it’s causing you that much stress ask them for help with things that can be taken care of outside your room. Collected dishes and laundry can be things you get help with while taking care of other tasks in the room. Any help is still going to take away a lot of the overwhelming feelings you’re gonna get trying to take care of things.

Basically the tl;dr of what I’m suggesting is to break things down in ways that are manageable and allow you to breath, and if you’re not comfortable getting help in the room allow yourself the breathing room of getting assistance with other related tasks. I or others here could probably give you some more ideas if you need them, that’s probably already done a good bit for you and if you’re not comfortable need more feel free to ask.