Having been in this position before, I know what you're going through. I worked with my PcP to ensure I was ready to even attempt to ride again. Luckily my crash happened at the end of the riding season here, so it gave me time to recover and get well. It was only a couple of months, but the doc ran some simple tests on me and then told me to start slowly and move up from there. The important thing was for my PcP to be sure there were no lingering symptoms, so if you go this route, be honest with your PcP about anything you're feeling, headaches, dizziness, blurred vision, etc.