I agree, MomtoGiuliana. You'd think I would have acclimated by now. No, I know I'm not chronically dehydrated. I'm good at my fluids. It's just all odd. I'm definitely well-treated for my hypothyroidism--natural desiccated thyroid has changed my life. Synthroid made my Dysautonomia HORRIBLE. So I think I can rule that out, as well. When we came up to this altitude, I had just gotten over the flu. I caught it mid-November, and had post-viral fatigue in December. So when we came here in mid-January, I did wonder if that contributed to everything. But to me, the first 1 1/2 months were like my Dysautonomia/MVP was in overdrive at this higher altitude--lots of palps, especially in the evenings, and VERY poor recovery from heavy activity. By early March, I felt like I was doing a LOT better. Had been walking again to build up my stamina. But I still recovered POORLY if we went out hiking. That just didn't make sense. Then in early April, along comes the movement headaches, and now, I have daily fatigue, even after sitting for hours. I wonder if I have anemia! Maybe being anemic explains the poor recovery from exercise, and could now explain the fatigue...and maybe the movement headaches last week. And if my husband and I are laughing hard about something, I have to PANT to get my breath back. Maybe....potential low iron has just made things worse. I also wonder if Dysautonomia or MVP use up more iron!!