I’ve tried retraining my vagus nerve with teaching from Dr Stephen Porges on polyvagal theory, in particular I bought a program to use for 10 30-min listening sessions called SSP, Safe and Sound Protocol. It uses music and the rhythms/tones of the songs to help retrain the brain as to how it hears sounds. I’ve done a lot of other vagus nerve practice this year too after my Cochlear Implant surgery for sudden single sided deafness so I can’t for sure say that the SSP was the one thing that helped, but I’m thrilled to report that I’m feeling better and making progress! If you’re interested you can message me and I’ll share more details. It was quite the journey finding sources to help. Best of luck to you. I see you and understand that sense of helplessness, friend.