First thing you ought to do is consult with your doctor about any issues. A seizure while riding on a heavily traveled road would not be good. Is a recurrence likely?
If the doctor is OK with it, I agree with the advice to go to your LBS and get a proper fitting bike. Make sure the bike can fit mudguards and a rack.
I have very little specialist clothing - just a wicking layer of poly shirts and tights, a high visibility vest for night riding, a helmet, and balaclava.
I also do a 11mi r/t commute, just started in Sept. after years on the couch, no problems. I'm 39. If I can do it, you certainly can.. good luck!