I've name changed too. I was half wondering if I sleep-posted this thread myself, as I'm in a very similar position and found my last admission traumatic. I don't want to freak you out though, as I already had pre existing difficulties that it exacerbated. This post is probably already going to be identifying to anybody who knows me, so I won't expand on that.
I don't think some many hospital staff appreciate the degree of trauma an admission can cause patients and that just because a person "gets through it" doesn't mean they won't be left with pieces to pick up afterwards if it's not handled right. So the plan you've got so far sounds great and ticks off a lot of the things I was going to suggest. Especially keeping the curtains closed - that can make such a huge difference, even if they're not soundproof! You might have to be pushy with some staff to make sure they respect it, but don't feel you can't.
In addition to the suggestions made it might be helpful to bring some comforting things, like your own blanket if it's soft and smells of home, or clothes that feel familiar and comforting but aren't precious. Plus things that will be comforting if it becomes too distressing. Think about how you can take a piece of home with you.
When packing it can be helpful to mentally walk through a day at the hospital to make sure you've thought of all the things you'll want or need. The fact you've been in before will give you a head start on that.
A mixture of ridiculously easy reading with your normal stuff might be an idea too if you're feeling too foggy or poorly to focus much. Maybe some of the really easy puzzle books to occupy your mind without exhausting yourself.
A notebook too so that if it helps you can tally how many days you've survived to reinforce to yourself that you're getting closer to home and time hasn't stood still (personally I find tallying how many days I've survived rather than days left is more helpful - I already know how many are left in my head, I don't want that reinforced until the last 24 hours. It's like a mental "look at you go! You're getting through this, it will be over soon!" Rather than an "oh god I'm trapped and it's never going to end". Iyswim.) Literally, just on page one: IIII... A nice dramatic size too if it helps! Or prewrite the dates in and cross the previous day off with a flourish each morning. Whatever works (if indeed this idea works for you at all).
A notebook could also help if it gets upsetting and you just want to vent in it.
You can pack your own snacks to help as well. It seemed like all the other patients had their own fully stocked corner shop laid out around their beds last time I was in.
Having your own bag, of your own things, that you packed yourself and were able to choose can give you back a bit of a feeling of control, especially if it gets distressing and you need some comfort.
I don't know what kind of things you'll need to eat in terms of hot or cold food, but I did find despite protected mealtimes if I was nil by mouth at lunchtime say, they would keep my lunch in the fridge for me until I could eat again. And they made me toast at 9pm once when I'd been too sick to eat all day. So there was some flexibility where they could manage it. I can't remember the job title of the staff who took all the menu orders and brought food round etc, but they were really thoughtful and accommodating. At least on that ward. So that part might be more manageable than you're expecting.
Do you have anyone who can visit you to advocate for you? Maybe just for peace of mind that if you're struggling to get them to take your needs seriously somebody else can support you. Or could you ahead of time write your concerns down and how you would like to be treated, so that you can give it to them? You've described how distressed you became last time, so if you end up feeling that way again it could be really helpful to already have your explanation written down along with what will help, so if you're not able to articulate it all clearly (kinda hard when one is upset) you'll be able to show them it? You might not need it, but I can imagine it might give you a lot more peace of mind to know you have it.
If you've already had your MRSA swabs I'm guessing it must be very soon. I really hope it goes smoothly and doesn't even come close to realising all your fears.
Being extremely cheeky, if and only if you feel able to update this thread afterwards - not in detail, just that you got through it and you're doing ok - would you consider it please? Don't feel obliged to though, I know you'll have other priorities.
You're so much braver than me. I don't see me being able to make myself do it, so I think you're amazing.