No

Not exactly as you describe, but this might interest you: https://www.npr.org/2024/06/10/1247296780/screen-apnea-why-screens-cause-shallow-breathing

I think it's also an ADHD thing. I didn't notice I did it until a partner in university would be like, "hey, you're breathing funny" every once and a while 🤷‍♀️

No, but, apparently I have to in order to sleep and it’s causing a bunch of problems.

Not usually no, but sometimes if I'm really deep in thought I realise all of a sudden I've been holding my breath without realising it because my head starts to hurt.

It's random and I don't have any kind of breathing pattern though.

On the contrary, if I notice my breathing, I find it distracting. I prefer to not be reminded of it, because it's going to take me a while to stop intentionally breathing again.

Typically no. Though recently I had to get some neurological tests, including one, where you need to look at a changing pattern on a display, while electrodes check your nerves/brain activity. The assistent again and again told me to look harder. (Apparently they can see that in the graph of the nerve activity) And it is really difficult to look harder, so I stopped breathing while trying.

I calm my breathing to focus at times rather than stop my breathing

yes

No.