I am a 22 year old female. I have recently noticed a strange feeling inside my left ear when I lie down on my belly. It feels like a menthol, icy sensation accompanied by a little pressure. Sometimes the feeling goes up the left side of my head a bit. It almost feels like my ear is falling asleep. It is worrying me into thinking I have some sort of brain tumor. I laid down and had the feeling about 30 minutes ago, sat up, and it still feels that way. It will go away over the hour, but if I lay back down on my belly it will return. Any ideas?