Really glad to hear that. My recommendation is to put a lot of emphasis on the "environment" step toward the end of the article. Otherwise, you might find yourself gaining a merely temporary hold of self-control only to get distracted and fall back into a previous pattern of thinking/behavior.

my technique has always been "if you need to do something but your ADHD won't let you, refuse to do anything else in the meantime". it takes less effort than suddenly deciding to get up and do the thing, but if done properly, culminates in you eventually deciding to get up and do the thing anyway. never thought of the holding breath thing though, that would probably result in less literally-fifteen-minute pauses wouldn't it