Has anyone tried vagus nerve therapies?

This might be a bit of a reach, but has anyone tried vagus nerve therapies? (e.g., Vagus Nerve Stimulation, or the Safe and Sound Protocol)?

I stumbled across this post on r/covidlonghaulers, which talks about vagus nerve disruption as a possible cause of long covid. One person in the comments says they found the Safe and Sound Protocol helpful. Just wondering if anyone here has any experience with this, or with other vagus nerve therapies.