We had a nice day outside, warm enough for t-shirt and shorts. I remember last summer when I got terribly fatigued and weak with palpitations in summer weather. Now today when I was going to climb the stairs to my home I got this same old thing with muscle weakness, it was so hard to climb those stairs. Does anyone else experience this? Is this typical for CFS, FM or both? The heat intolerance seem to be neurological somehow.