The end.

I probably should have just gone up the road about half a mile from where I camped, but I was stubborn. I wasn't feeling nauseous when I woke up on Sunday morning, and I was able to eat some very slowly. So, I headed off again.
The day involved a slow and steady uphill hike up the dry Blue Creek bed..

..and then eventually a much steeper ascent up the mountains and back into the basin on the west side. I was relatively alright at first, but was stilling having to make 5 minute breaks about every 15 minutes. Then I started to feel nauseous again, and when I tried to eat I would gag with each bite. I began to progress very slowly and the heat only made it worse. After nearly 5 hours I had only gone about 4 miles. I had exited the creek bed and begun to enter an area with trees again, but I had to stop and think. I knew that there was still 3 or 4 miles of more intense uphill before I reached the crest of the basin, and I decided that if I tried to continue on I would probably not make it and may have to be rescued due to my exhaustion.
So, I turned back. This is a view of the furthest point that I reached:

Incredibly it only took me 2 hours to do the hike back to where the trail ran into the road; though I was driven and knew I had to succeed at this point.. and it was a slow downhill, so that always helps.
Finally, around 1800 on Sunday I was back at the Homer Wilson Ranch and luckily a couple had stopped there to check it out when I arrived. They thankfully took me back to my car and I hobbled back over to it with my pack. I was actually able to eat when I had the relatively good food at the restaurant in Big Bend.. though very slowly. I think that the smell of the food that I had was just making me feel sick as well... which has also led me to conclude that I should get a stove and start having better food when I'm camping.
After eating, I decided I needed a motel to recuperate (I know I said I wasn't going to stay in hotels.. but I was not well.. and I suppose I'll have to make sacrifices like these when necessary), so I drove 2 hours to Fort Stockton and got a room for 2 nights.
Now today I'm on a public computer in Fort Stockton. I'll be going to Carlsbad Caverns NP and Guadalupe Mountains NP next. Not sure when I'll post next.. but some time this week....