This is a longshot but 3 weeks ago I ended up in ER . . . I was feeling great, nothing going on, and all of a sudden, I was off balance, etc. .. . .. after 10 or 15 minutes when it did not clear and it was getting worse, well, I thought the worse and went to ER . . . after doing some tests including a CT scan (to rule out stroke), the ER doc said that it could be anything for a type of virus to something in my inner ear system, etc. He gave me a prescription for meds to help with the vertigo (it was 24/7 along with a feeling of carsickness) and told me to see my family doc which I did. Now, the meds took care of the severity of the vertigo although it did not get rid of it and I still felt car sick. Also the meds may be dopey and frankly stupid . . . after 10 days on the meds, I saw my family doc who also has a specialty in ears, nose, and throat . . . he did some tests and looked way too deep into my ear and told me that it appeared to be Benign paroxysmal positional vertigo (BPPV) . . . apparently the crystals in the inner ear move out of whack and pressure the nerve endings, etc. He did a type of treatment (which invoked vertigo agin) but about 5 or so hours later, I had a decrease in the vertigo . . .all of this to say, that after a couple of treatments and at home exercises, I am about 85% better . . . doc says it is a matter of time and as long as I am getting better, then it was BPPV . . .
Now, I am not a med professional, but you may want to ask your family doc if it is possible that it might be BPPV . . . I had a slew of bloodwork done to rule out everything you can imagine along with the CT scan . . . it is more or less a diagnosis by default but it seemed to be the right one for me . . . now, I don't know about the earphones, so I am out of my league there . . .I do know how disconcerting and scary this was for me, so I hope things get better for you quickly . . . .let us know how you are doing . . .take care, kc