Fun fact: GAD and ADHD aren't opposites, but quite related. Meaning, you can end up suffering the symptoms of both.
FWIW, despite being more like GP's wife than GP themselves, "the process of quantifying the problem could become its own problem" is very much the case for me. It leads to some unique, hilarious (to an outside observer) ways of suffering.
It's super common to have both. It develops naturally from understanding how ADD affects you and stressing about what you might be forgetting or overlooking or whatever now. They can feed on each other. It's easy to imagine how ADD symptoms could develop from GAD.
I was born with ADD, but developed GAD in my 30s in response to living with ADD.
FWIW, despite being more like GP's wife than GP themselves, "the process of quantifying the problem could become its own problem" is very much the case for me. It leads to some unique, hilarious (to an outside observer) ways of suffering.