My 5 1/2+ years of Long Covid has left me with dysautonomia: highBP/HR but with syncope from ‘postural hypotension, not Pots’, plus breathlessness, fatigue, all over body ache, no sense of smell…. I had hoped at least one symptom would get better with vagus nerve stimulation with Tens and ear clip…see the excellent Facebook group ‘ AVA: a vagus adventure’ with personal experience, info.on lots of devices, successes/ failures, and video clips how to use devices correctly. I tried my device for two periods of about 4-6 weeks each going very slowly changing ‘power’ and time but seemed to get higher HR instead of improvements…Will try again. If you look at the AVA group you’ll see the report mentioned above would be generally regarded as trying ‘too fast, too soon’…food for thought!