Take a break from soccer, possibly indefinite.

I played very high level soccer, and have not been able to play after my concussion. I could probably play a friendly non-agressive game without too many symptoms except heading the ball is really out of the question for me, and without that skill playing at a high level is not possible.

Take time off to let your brain heal, and pick up a less intensive sport, I personally am thinking about starting to swim more competitively.