SARS-CoV-2 hasn’t specialised in humans properly yet and since it targets the ACE-2 receptor, which is present in lots of different cells in the body, it can attack lots of different parts of your body. That’s why there’s such a wide range of symtoms as well. I wonder if that’s why you experienced what you did.
Not a clue, they're all kinda flu like symptoms, just very specific, rather than flu/cold that just sort of starts as a sniffle and maybe a sore throat, then next thing you're hit with a whole whack of stuff.