I have 2 different pillows, a water pillow which you can adjust the water levels and a gel/foam pillow.

I use a different pillow depending on how my head and neck feel, but general speaking I like a low pillow to minimize neck flexion. I have also slept with a neck pillow (the ones people use on airplanes).

The fog and confussion in the morning is pretty common, for me it usually is related to how much I did the day before or what I did. I keep a diary to see if I can find commonalities when things are really bad and I rate my pain and fatigue every day.

Take Care.....