The one from ADD makes me do... nothing. I feel paralyzed somehow. I scream at myself in my mind to finally start the task, I know I have to but my body won't move. It's hard to explain.
Then there is the procrastination as described in the article. I think it makes me do something else instead that I have put off, like cleaning or the sudden urge to finally learn a new programming language / framework. Like, I feel better and worse at the same time! I did something productive, at the cost of what I should have done.
They might overlap, I guess.