https://www.the-sun.com/health/6022957/warning-covid-side-effect-two-years-later/
Now this is not good news! Luckily, I did not suffer from depression during Covid. However as one who got "long covid", including brain fog, I can attest to the fact that you don't want it. To me it felt like dementia must feel to those poor souls who are suffering with that condition.
On the other hand, it's good to know that this actually happens, so that if it happens to you then you know it will go away, and you don't think you're going nuts.
I love that this study (from Lancet) looked at 1.25 million people who had Covid. A big "N" like that gives me more confidence in the study.
Personally, I think I am done with brain fog. In 23 days it will have been a year since I was first hospitalized with severe Covid double pneumonia. I still have some trouble remembering names occasionally, and so on; but then I'm 74 and I suspect it would be unusual if that never happened at my age.