I'm still feeling immense pain on the back of my head when resting on my head?1 week post-op.

Hi it's now the 5th day after my FUE hair transplant and I had 2,200 grafts to restore my hairline. Of an evening when trying to sleep I still can't rest the back my head on the pillow and have to make a cushion with bandages and cotton wool to ease the pressure on the donor area. It's constant sharp shooting pains in loads of different areas of the donor area. The donor area itself is pretty much healed and there is very minor redding on the area. Is this normal? How can I take this pain away? Thank you