I've never heard of that happening, but I'm also curious to see if other guys here have experienced that or heard of it. So it happens about a week after shaving? Do you wear a hat when you don't shave?
Hi. Could it be that your body knows that it's going into headache mode which results in you being lazy and not shaving? Are you a sufferer of cluster headaches? Those show up frequently and are often classified as worse than migraines, then they suddenly disappear for awhile and come back just as suddenly.