Puzzled!

I do not understand! and I do not have a tiniest idea about why...

I am a right hand  person and I am a left ear person! I always have the phone on left ear and I suppose the rest of my hearing relies on that ear. It is the sensitive one also and is the first in line to complain if something is wrong.

Therefore I have done my music training/listening only with my right earplug on as low level as possibly. But still it was the left ear to start hurting. Are the nerves bundled somehow so there is some kind of phantom pain or something?