This is different but my daughter was sedated for a long time while on a ventilator, following an accident. She had a kind of amnesia where she does not remember about 3 months of the time after the sedation, and at the time scored in the 7th percentile on certain cognitive tests (she has just graduated from Harvard). Her function returned and she got a PhD. For awhile I feared she was going to be cognitively disabled.

Of course at 73 our brains might have less ability to recover quickly but I know friends with COVID brain fog, who are older than 73, have recovered. This must be upsetting.

I totally agree with your experience with doctors by the way. Even my neurologist, who I have seen for 20 years, now says things like "well, you are older now" for symptoms I had at 50, as if they don't matter anymore. It's kind of like "what do you expect." I am not a complainer. But I have noticed a change in MD attitudes since I hit 70.