horsegal,

first things first. Don't do anything that would increase your risk of hitting your head for a few months. Trust me, if you are feeling concussion symptoms now, then you do not want another one any time soon. The symptoms will persist much longer the second time.

Every injury is different and you need to judge the exercise thing based on how you are feeling. Start walking for a few days and if you feel ok, then start jogging. If you still feel ok after jogging, then maybe you can do more. As soon as you start feeling bad I would take it easy for a few days. "No pain, no gain" does not apply to exercise with PCS. That will just make things worse.

With my head injury I felt terrible for a week like you, then started feeling normal and went back to lifting weights and doing heavy cardio. It made me feel terrible, but I thought I could tough it out. After 2 weeks I was feeling really bad and it is possible that doing too much too soon made my symptoms stick around for a long time.