I am in my 5th year of long covid, sick 11/2020 before vaccines came out. I traveled a couple weeks ago and was really messed up from it. I was sick/crashed/brain dead for 3 of the 7 days, then for a week after returning home.
What I've have come to believe is travel is VERY strenuous brain work. I struggle packing, have to get to the airport, look for the bag check, figure out how to print the bag tag, find where to check and drop off the bag, remember what I was told about which TSA place to go through, find the line pre-checked line, think about what do I need to put through their scanner, retrieve my things & check that I have everything, find out which gate and find my way there, find the bathroom, find the bottle refill station, do I want snacks or not, pay attention to the call for boarding & the right group, scan my ticket, find my seat & overhead bin, then all that in reverse upon landing.
It is easier landing in an airport I am familiar with, but nasty in a new one, finding which carousel for baggage retrieval then transportation.
I get overwhelmed, loose half the time I am gone with recovery alone, and then pay for it for a week after I get home.
MUCH more exhausting than working spreadsheets, finances or legal affairs at home!
This helps: My packing list is written and saved on my laptop so all I need to do is print it out. Reminders for reservations I need to make ahead of time is on the list (book flight, rental car, taxi to & from my local airport, boarding for my dog, lodging reservation & confirmations, hold the mail, let neighbors know I will be gone, send flight info to family members). Also last minute things when I am leaving (turning the water supply off, set the house alarm, bring my keys to unlock the house when I return, turn down the thermostat or up the AC) and take out the garbage.
Memory and balance problems problems begin at just preparing to go-I fell down the stairs the morning I was leaving).
good luck next time!!
RMS