Over the years I have gone on hundreds of rides without eating first, never ever did I get dizzy to the point of passing out or loosing control. are you sure you don't have some underlying medical issue? And I am talking rides up to 50 miles in length. In fact, years ago when I raced, I routinely rode 50 miles before breakfast, sometimes eating an apple enroute, never any issue what so ever. So I agree, if I was you I would never ride without a helmet. You also may want to consider giving up your drivers license in case you don't eat something before driving.