Lol, Whataburger! I used to live in TX and boy, did I love that place. I actually gained about 10 pounds eating there. Evil, evil :) And the worst part is it's open 24 hours!!
I have nausea while fasting as well.. I am not doing water only, just clear liquids.. but I find that after a while all I want is water because anything else makes me feel ill. I also noticed that an injury in my lower back was not flaring up at all. Usually when I lean over the (very low set) sink to brush my teeth, my back spasms and I have to change positions. But after about 3 days of just liquids (including soup) it didn't hurt at all.