Interesting discussion on pillows. I've been having this issue for years and thought it was just me. I have mild scoliosis at the top of the spine. Hate to think how much I've spent trying different pillows!! I've settled on a moulded one which has a higher bit at the back, a dip in the middle, and a lower hump at the front. I also sometimes elevate it slightly at the back by sticking some old PJ's under it.
Grandma so sorry that you are still having the head pressure / aches. You are definitely allowed to be cranky!!
