Oh My! I would never ever think about getting on a bike or even a trike! I used to ride bikes and enjoyed but I would not risk it now.

If I were you, I'd discuss this with my doctor before getting back on the bike. You don't want to hit your head again, as it could make things a lot worse for you....

As I said, I'm not expert, but I would certainly be discussing what you should/should not be doing i.e. riding bikes, playing ball etc. with your doctor before attempting.

Melek