Have you tried to learn when you are at the very beginning of over-doing it?

Yes. I usually am great at knowing when I'm at the beginning of over-doing it; mostly because I can easily overdo it, and the consequences are not worth it. The week where I felt good, I thought headaches were something that could be ignored, but was clearly wrong.

How long do you play the brain games ? Lumosity like stuff ?

I played for around 10-15 minutes at a time. Yes, Lumosity and similar apps, as well as Donalee Markus' Designs For Strong Minds exercises.

What kind of puzzles ?
Brain Games #1: Lower Your Brain Age in Minutes a Day (Brain Games (Numbered)): Editors of Publications International: 978141271451: Amazon.com: Books

What kind of reading ? fiction, non-fiction, technical, news, ?

Mostly non-fiction. During the good week, I read about 200-300 pages. Maybe more. Why Isn't My Brain Working? by Datis Kharrazian, Norman Doidge's The Brain That Heals Itself, and The Ghost in My Brain by Clark Elliot were the books that I was reading.