<s>[INST] We were camping in west Texas Big Bend NP. We have been camping in the area for some 30 years. We rode mt bikes one day, and drank a moderate amount of water. Around sunrise my wife and I were in our sleeping bags waiting for the sun to come up and warm up some. As I was laying there I suddenly fetl dizzy, I couldn t focus on the tent, I got double vision and vertigo. I became very nausea and had dry heaves for half an hour. After about another hour on my hands and knees I was able to sit in a chair but I couldn t look up without getting vertigo. I sipped on water with electrolytes for several hours thinking that maybe I was dehydrated. But I have never had this before and I know I have pushed my water intake a lot more. I looked up dehydration and electrolyte depletion when I got hom but none of the symptoms describe what I had. What do you think? [/INST] Hello! Welcome on Chat Doctor ! I agree with you that your symptoms are not typical of deny Chat Doctor.  An inner ear disorder could also explain your symptoms. For this reason, if the problem repeats, I would recommend consulting with an ENT specialist in order to exclude an inner ear disorder. It is also necessary performing an X-Ray study of the cervical spine to exclude chronic degeneration of the vertebral column. Hope you will find this answer helpful! Best wishes,  </s>