Hi, I am a friend of lene87 who got interested in this problem complex when another friend got symptoms of periodic paralysis (PP) after Covid.
PP is extremely rare, it is estimated that only around 75 ppl have it in Norway, out of a population of 5 million. It is even rarer to get it as an adult, but not impossible - there are a few studies out there of how Covid can "mess up" the ion channels in your body's membranes.
I've come across a grand total of five new possible "post Covid" PP-cases in the last year, but most likely there are many more out there, either without a diagnosis, or, especially if female, with a psych diagnosis.

Short version:
"Each type of Primary periodic paralysis (PPP) can have its own pattern of symptoms. For example:
HyperKPP:
- Attacks can be shorter and less severe, but can happen more often.
- Your symptoms can come on quickly, sometimes causing you to fall.
- Between episodes, you may have muscle spasms or trouble relaxing your muscles.

HypoKPP:
- You may have attacks every day, or you may have them once a year.
- Attacks can last anywhere from an hour to a day or two.
- Some people have weakness that changes from day to day. Later on, your muscles could become permanently weak and your symptoms could get more severe."
https://www.webmd.com/brain/primary-periodic-paralysis?