This is less about being turned around and more about overestimating my abilities. I was in Eastern Oregon helping a buddy during deer season. We spike camped on top of a long ridge and were planning to drop into the adjacent canyon to glass. Opening morning no deer were spotted but I had a small elk shed glassed at 11 AM on the opposite side of the canyon. Confident I could get there and back quickly if I went light I stripped off a few layers and left my pack, including my food and water (of which I had only taken a sip all morning), with my buddy and headed down the canyon. It took me over an hour to get to the shed on the other side. I picked a different ridge to climb out of the canyon, thinking I would get on top, jump two ridges over and meet back up to help glass some more. The snow started falling as I climbed out and I quickly realized I was ill-prepared. About halfway up my legs started cramping and I recognized sure signs of dehydration. The thin air also was hitting me hard and had me climbing only a few yards at a time (I primarily hunt on the coast). It took me 3 hours to climb the remaining 2,000 ft. elevation to the top, and by the time I got there my head was in a fog and both legs were severely cramped.
At this point I was a mile from camp, hiking through a decent snowstorm on a ridge I had seen for the first time that morning. I realized I did not mark the camp location on OnX and my phone battery was quickly expiring. With blurred vision I stumbled my way towards camp for about a mile without recognizing any of my surroundings. I did get ahold of my buddy, who had grabbed my gear and was headed towards camp as well. Eventually I spotted our tent and breathed a huge sigh of relief. Once I got there I laid in the tent drinking water and eating my first meal of the day, thankful things didn't turn out worse.
In hindsight, I was completely unprepared and felt pretty dumb for drinking almost no water and leaving my water behind. Lessons learned. I made sure to mark the camp location on OnX as I laid there recovering.