I went to visit my family doctor on Friday. He was quite concerned about the array of symptoms that I told him had occurred on the Chemin de St. Jacques. He has ordered a bunch of blood work, a chest Xray, a resting ECG and an ECG under stress. He said that it is possible that all the symptoms were a result of excessive effort at altitude, but he wants to rule out anything else. I have not a recurrence of the symptoms since leaving France. I will keep you posted.