You're the one who seems to be a mess.
Figure it out.
You are acting as if you are a child with no agency, when in r.e.a.l.i.t.y, you are an adult with full autonomy!
THINK, instead of allowing yourself to get overwhelmed.
LOOK AHEAD, and plan accordingly, instead of being "surprised" when normal things happen.
You could:
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Put Teams on DND for the morning of your return from vacation, so you can catch up
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Block off your calendar for the same time period, so people know not to send you mtg. invites for calls until at least after noon of that day
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Don't respond to texts until after lunch on your first day back
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If someone physically stops by your desk to make requests, ask them if it's a dire emergency. If they say anything but yes, tell them to email you their request, and that you'll get to it as soon as bandwidth allows, since you're catching up from being on vacay.
People will treat (or mistreat) you with whatever you allow.
Don't allow yourself to be overwhelmed and bullied or rushed, just because someone else wants things yesterday, and you were on vacation then.
Unless something is a genuinely dire emergency, their request can wait (but be responsible and professional about getting back to them, and working out a reasonable timeline/deadline for deliverables.)
Most people understand that there is a certain amount of catch-up time a person needs, when they're returning from vacation. It's up to you to communicate your situation, and up to them to be humane with accommodating that.
Of course if it REALLY stresses you out SO MUCH, where you're using the tired and over-used word of, "anxiety" to describe your state of mind, then do yourself a favor and next time you're OOO, give yourself an UNPAID half (or full?) day to log on to your work stuff and get caught up that way, before officially being back to work.
Don't like that option?
Then su-k it up and deal.
Everyone else does.