DeanBJJ,

Welcome to NeuroTalk.

You have asked a great question. Contact sports are a high risk, especially for you.

It sounds like you are depending on physio and whoever adjusts your neck to fix you. That will not help as much as you hope.

You need to work at your own directed healing. Head impact whiplash neck injuries require serious discipline so the upper neck can stabilize. This means disciplined posture while sleeping. Many 'neck adjustments' are too aggressive. The C-1 and C-2 joints are not self aligning like the lower cervical vertebra. They are slow to stabilize.

Physios like to work on range of motion. That is often not helpful. That should come after the neck as regained stability.

Most chiros like to do 'twist the head and pop the neck' adjustments. Those are fine for the lower vertebra but are questionable for C-1 and C-2 joints. Gentle traction and mobilization is good. There are upper cervical specialists

Learning to sleep with good posture is important.

If you choose to continue with grappling or other contact sports, you can plan on a roller coaster ride from the traumas you experience. You may lose the ability to work in a high paced, high stress job. Many do.