BRAG fall ride with hills and head winds

This century ride was like no other in that I did not have the complete belief that I was prepared physically to ride 100 miles. My last 60 mile ride a few weeks ago saw me black out in my wife's presence one hour after the ride. I felt fine after the ride, but after sitting in the recliner for an hour after my shower I tried to stand up and got intense leg cramps. When I finally stood up I got dizzy and sat back down. My wife told me later that I had blacked out and my body was shaking. I have never experienced this after any sort of exercise activity. My my doctor's test and wife believes I have a deficiency in manganese. I believe that I can not ride with the 40 somethings at 20+ MPH for 30 miles and then ride another 30 miles st my normal 16 MPH pace. My wife has been feeding me mineral rich foods including bone marrow soup with green leafy stuff like kale. She has also been stuffing a few vitamin supplements in my mouth every evening. All in all I have renew...