Primary sources from those who were with Lee and knew of such an infirmity flaring at Gettysburg? Citations from reputable historians?
If so i'd be real interested in seeing it. Please link them here if you have them handy. --Thanks.
What is known is that Lee did have bouts of what we would today call Angina Pectoris, but no contemporary evidence that he suffered any such attacks during the Gettysburg Campaign exists. If you have such evidence, please point to it. Again, thanks ahead of time.
He did suffer from what appears to be dysentery during the Gettysburg Campaign, but appears to have recovered by the third day.
Other men, even commanders have served remarkably well under similar circumstances. The first name that would come to mind is Major General Frank Merrill of the famous Merrill's Marauders in the China-Burma theatre of WWII. A close second, maybe even first, would be Brigadier General Theodore Roosevelt Jr.
I don’t link. If you want to read up on his heart problems, do the work yourself.
And please! A general during WWII had much the same health advice and medical treatment as a mid-19th century southern general. Yeah, right...
If Lee was ill, and unable to command, he had an obligation to turn the command over to an officer capable of conducting the battle. That would have probably been Longstreet. Lee chose not to do this. He, and he alone is responsible for the debacle at Gettysburg. A fact that the lost causers refuse to recognize.