Hi Kythe, I had that problem for yrs, could never figure out what caused it. I always had regular cot/poly sheets on the bed. One yr. my DH and I decided to buy flannel sheets for the winter. He thought it might be warmer for me 'cause I'm always cold. While we had the sheets on I didn't notice anything, but as soon as I changed the sheets back to the old ones, my ear hurt like crazy. I was trying to figure out what was causing it, the only thing different was the set of sheets. I got rid of all my old sheets and I only use flannel. I need very soft things touching my body. I'm also a side sleeper, that ends up on my back. I can't sleep on my stomach, even as a child. I feel like I can't breathe, and my back locks. Right now, I can't sleep on my right side, due to injury and I'm going crazy (short trip lol) It is hard trying to sleep on my left.
Maybe you could try a set of flannel pillowcases and see how they work for you. Hope this helps.
God bless. Alice.