Good Day, Bad Day: Do you track them with long COVID?

Greetings all. I'm a COVID long hauler and have been for about three years now. My principal symptoms are chronic fatigue and brain fog. One thing I've discovered is that I have good days and bad days in a kind of pattern.

A few months into all this someone (I've forgotten who... blasted brain fog) suggested that I keep a 'health diary' keeping track of my days. Being a bit of data geek, I started recording the time when I got up and the time when I 'ran out of steam' ... when the fatigue became too much for me to keep up activity. Then (OK, I'm a huge data geek), I started plugging those times into an excel spreadsheet, charted them and the pattern jumped out at me.

I'd get about 3-4 'good' hours one day, then 1-2 hours the next, then back to 3-4. The pattern isn't perfect. Sometimes I'll have a few bad days, or more rarely good days, in a row, and the definition of a 'good hour' is still pretty bad by any objective standards, but the pattern consistent enough that I feel confident about it.

Knowing that, no matter how bad a day is, there's a good day coming has really helped me keep my spirits up through this.

I wondered if anyone else has a similar experience.