One of my "executive function" problems is that I get overwhelmed when I think about things I need to do. I noticed that a sort of movie starts playing in my head of how to accomplish the task, i.e. the steps entailed, resources needed, etc.

What happens frequently is that my brain takes multiple discrete tasks and attempts to simulate each one's steps to completion simultaneously. I suddenly find myself at the front door paralyzed for five minutes, "Should I grab the trash since I'm going to go check the mail? I have to walk the dog, I can't carry all this trash while holding the dog. Where will I put the dog when I get the mail. Ok, put the leash on the dog, grab the trash... Crap, there's so much trash! Ok, just take the office trash out..."

ADHD medicine stopped working after a month. What has helped a lot is N-acetylcysteine. In fact, it's been several months and I'm comfortable saying that it has changed my life. The trainwreck thought loops give way to singular chains of focus.