I too was out in the sun for about 40 minutes but I didn't feel uncomfortable. Then without warning, I felt I was starting to faint and get nauseous. My husband rushed to my side, put me in the car and was on the way to the ER. I was breathing heavily and fast.. heatstroke he said. We were not home but 40 min. from home. Before we got home, I was breathing all right, but still sick and headachy and chest pain. Is that what you suffered, kyc117? I think we may be more sensitive to the heat than we were before neuropathy.