I know a couple of people who caught Covid-19 back before the summer, who both described the same symptoms after recovering (and testing negative). This was a while before all this talk of 'Long Covid' came about.

Since we're all different, and will all fight viruses in different ways and strengths (depending on health/existing cnditions etc.), there'll be so many variations in how much of a 'toll' fighting it has taken on our bodies (and minds).

Since this ia a 'novel' virus, we can only really base any conlusions on the empirical evidence as it comes in.