xRavenx, I'm so glad you started a thread on this topic! I was thinking about this bipolar symptom just yesterday. I agree with the other posters above that many people with bipolar disorder can relate to this. Increase in goal/project directed activities is literally a symptom in the DSM-5 for bipolar disorder. I definitely experienced this symptom many times in my life. In fact, it was one of my more common ones. I have sometimes referred to the tunnel vision type focus as "hyperfocus", though that word is generally exclusively used for ADHD, or sometimes OCD. But I think simply referring to it with different words doesn't make it a different symptom. I realize that bipolar episodes can sometimes also cause symptoms where we can't focus. Like what rapid thinking might do. Or picturing ourselves racing around like chickens with our heads cut off, one second thinking about one thing, another seemingly four things at the same time.

Towards the end of my time at my last job, I was completely overwhelmed by the work I had to do. A huge part of that was my own fault. I had proposed a number of projects to improve communications for the company. Because they were all my ideas, I was tasked with implementing them (design, cooperation with IT, management of staff under me, content writing). It became like a tidal wave that overcame me. And that was right after another behemoth project I had completed. How one person could do so much is mind-boggling, when looking back! The extreme amount of information I memorized and utilized, the creative effort it took, the speed in which I implemented it It was like a race of a century for me, both psychologically and physically. Ideas, numbers, words, facts, strategies, typing, and images shooting around in my mind and out through my fingers, like sparks and explosions. And yet, there was still a central goal and I wouldn't and couldn't stop until I reached it.

It's no wonder that many people with bipolar disorder become unable to finish huge projects, especially if other responsibilities are assumed, as well. The mountain is too high. Extreme insanity fully set in. Eventual panic, mental overheating/spontaneous combustion. Avalanche. Screaming. Violence or self-harm. Fall into deep depression.