Yes, I think this is very normal, though I can’t say if it’s universal or nearly universal, and I assume thresholds vary. I suspect there are people who’ve never thought hard enough, long enough to experience it, though.
I have never been very good at predicting when this will happen or how long it will last. Some other people seem better able to do that, some worse.
I’ve found that for me, having someone else (not a group, just one or two people, I am very much an introvert in this) working on/thinking about the same thing, and talking to them about it in real time, is often helpful, at least if it is something I genuinely care about; I find that helps me regain some mental energy as long as I’m not too far gone.
Re the second sentence: lol. Yeah, I bet you’re right.
Your last paragraph is interesting to me. I don’t think I can say that I’ve had the same experience, though I do think that some people have that effect on me. I can think of at least one person who I normally don’t run out of gas when I’m talking to them. But I think other people actually amplify the problem. For example, I meet with three of my friends for a friendly debate on a weekly basis, and the things they say frequently run against the grain of my mind, and I often run out of gas while trying to figure out how to respond to them.
That’s true for me too, there’s definitely people I resonate with that way and people I don’t.