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...same feelings here as Jeebs....worth a try. have always wondered about our "active" vocalizations that seem above and beyond those experiencing extreme pain. thinking back patients here for one, as i am one. totally theorizing that it is an attempt to influence "some" bodily function that will relieve our pain. sometimes it's voluntary, and sometimes just feels necessary. could it be the vagus we are hunting? dunno ...never seemed to work for me tho studies have shown that vulgarities/profanities shouted in the midst of anxiety do have, if nothing else, at least psychological benefits. since it was mostly wasted energy/made things worse in my experience, i trained myself to remain calm and non vocal while hitting the O2 and concentrating on "breathe" only. before that carried a (soon soggy) pillow to scream into in deference to the neighbors... ...i do think it behooves anyone wishing to explore vagus nerve stimulation to try out the VNS device. 'tis specifically designed to do such. i occasionally see a positive report for CH patients....but it has not caught on so apparently only works for some (who wouldn't want to be one. only one way to find out)...tho i bet $$$ w/o insurance approval.

I wouldn't discount techniques for stimulating the vagus nerve as worthy experiments. I know Wim Hof claims that submersion (or showering) in cold water has a big vagus effect. I can't claim to know whether that is a legit scientific fact though. Then there's one gal on Tik Tok (which granted could really impact credibility!) who suggests placing an ice pack right on the middle of your chest as the instant/convenient/super direct way to get the same kind of vagus thing going on (in that case it was was presented in the context of relieving anxiety and insomnia).

No but I sure have done a bunch of cursing along with some unspecified sounds

Has anyone tried humming or load gargling to stimulate the vagus nerve?