Anyone can easily do a 6-mile flat ride in 30 minutes. But even it takes you an hour (how on earth do you ride on flat ground at a 6 mph pace? It makes me sleepy just thinking about it.), it is totally pointless to wonder about so-called "energy drinks" and gels and etc. You just don't need them. Again - they do nothing for you, the effect is completely in your head.
You really should get checked out for general health and nutritional issues. You sound like several accidents waiting to happen.