Great reply, and there is so much to think about here that I put off replying for a few days. I also did a bit of reading on your forum at dtb, which put more context around this.
Broadly, when I'm running good, I feel like I'm sitting at the tables with a specific plan of attack, know how to respond to different types of players/table conditions, and feel competent. When I'm running bad, I question my game a lot. It feels very much like the Sun Tzu quote in
The Poker Mindset - "Victorious warriors win first and then go to war, while defeated warriors go to war first and then seek to win." I feel like I have some measure of control in the first scenario (control over whether I'm making +Ev moves or not given table conditions), while in the second I feel like I'm "stabbing" at different tactics and playing catchup, trying to find opportunities rather than thinking I have the opportunities mapped out in advance.
I've invested a ton of time, so I have a good deal of self-image tied up in the game, and I'm sure that's having an impact. I have a number of personal goals tied up in the game as well, but I'm reluctant to post them in a public forum.
I realize I haven't directly replied to all the points in your reply, but did want to say thanks for a very thought provoking reply.