qizzical, that is actually quite a typical trait you describe. While not the impulsive spur of the moment type it is in a sense still spontaneous. The “what the hell” response is in effect spontaneous in the end. Lots of ADD people have trouble making decisions – I guess the overwhelm of so much to think about manifests itself as procrastination and in the end the decision is often made in a push comes to shove kind of way. All the stuff I’m sorting that’s been stuffed into my basement for all these years is an attestation to this!
I think the Kate Kelly and Sari Solden books describe it. If I could find the books I’d look it up 