So sorry to hear about your injury. Welcome to the board! It's good be among people who understand.

Pins and needles in the last two fingers of your hand is almost certainly related to something in your cervical spine (neck). It would be good to consult a physical therapist or physiatrist about it; it probably can be treated with exercises to release the pinched nerve.

I also had much less problem with this after I got an ergonomic pillow with a "bump" to support my neck in a straight position.