question: Hello, I recently traveled up to Mammoth (elevation between 7900 - 8900 ft) for the Memorial Day Weekend. We arrived on Friday evening. I felt fine all day Saturday and Sunday. After going in to bed on Sunday night I was restless and had a hard time sleeping. I started shivering and had chills. I think I started to scare myself and started having some anxiety which was making me feel like I wasn t breathing right - though I know I wasn t really breathless, didn t have shortness of breath nor was my heart rate irregular. I ended up taking my temperature at it was just under 100 degrees (normal for me is in the 97-low 98 degrees). I could tell my temperature rose a bit more as I got really warm then sweaty. I felt very dehydrated and kept drinking a lot of fluids. I was somewhat dizzy and felt a slighly nauseated. I couldn t sleep for most of the night. I took some ibuprofin and finally dosed off around 4 in the morning. I woke up around 6/7 am and didn t feel any better. My fever had come back (still low grade) and then I had a headache and body aches. I did start having some chest tightness and aches in my chest area too - similar to when my asthma acts up. As the morning went on I felt a little bit better but still had a headache, body aches and low grade fever. We left the area around noon and went back home (which is close to sea level). I felt much better still had some of the symptoms. My fever rose to almost 101 during the night (last night) but dropped after taking ibuprofin this morning. I still have had a slight headache but it and the aches have improved. Temperature hasn t risen since the night again. Question - does this sound more like a flu or virus or could it have been altitude sickness? or something else? Some of the symptoms sound like it could have been but not sure since I did have a fever and it came on after 48 hrs of being at that elevation (we slept at the lower elevation).