I've had my bell rung a few times. Here is my advise.
If you think you have the package to take it all the way, then follow doc's orders and continue your path.
But, if you lack the skills or the desire, adjust your training. You don't need to go balls out when throwing leather to keep your skills up. Find guys to do moderate sparing/kickboxing with, keep up the grappling, and stay conditioned. Heavy bag and speed bag work will do wonders for you.
Why do I think this you ask? Have you ever looked at the guys who made a living fighting? They are way old before their time. The pros I've know live on ibuprofren and speed, and walk like they're 60 when they are in their 30's. I have no desire to feel like that.