An “inhaling” stim?

For years, this thing I do has baffled me. And I *just * realized that maybe this could be a stim.

I will suddenly, out of nowhere breathe in sharply. Just one, and then it feels almost like a bit of relief flows through me.

I have EDS and some heart complications from that so at first I was wondering if it was related but medically, everything was ruled out.

Also I only ever do it alone. I don’t think I’ve done it around other people.

Anyone have a stim like this? It’s a bit of an odd one for me that I’m trying to figure out.