On a more serious note you bring up a phrase I'm all too familiar with - "brain fog." Can't remember what I did 5 minutes ago let alone yesterday. It's like a big cloud up in your head and makes having a job a bitch to keep. Seriously my boss tells me all the time I need to pay more attention to detail and stop daydreaming. But i'm not daydreaming.
On a TRT+ dose of test and nothing else I have very good memory and mental acuity is good. Mentally that's the best I feel when it comes to hormone supplementation. But I feel just about as good off when I'm recovered. But that first couple of weeks of a TRT+ dose of test and it feels really good mental acuity and memory wise.