So sorry to hear this, but glad to hear that you should make a full recovery!

DH has had 2 concussions, and I have cared for him with both. With both, he blacked out for a very short time, and then "woke up" but doesn't recall much. Minimizing screen time, tv, reading - anything that taxes the brain - is huge. He couldn't do that, and it took him much longer to recover. Sitting in a quiet room really is what you sort of have to do. Be gentle with yourself - things may feel weird and frustrating for quite a while - but it will get better. The other reason for not getting back on the bike immediately is something called second impact syndrome. Listen to your doc - it's not worth the risk. And, of course, replace that helmet!

It might also be worth asking your doc whether a fish oil (DHA) supplement would be appropriate. DH was strongly advised to take it (in large doses) based upon some research here (football injuries). It helped a lot.