Maser, I dunno what you do for work, but when I started doing concrete for work I was very much in the same boat. The first week was pure hell, and I was one sick feeling kid.
Fill up a couple of milk jugs with water. Drag one of them around with you, stash it in the nearest shade or just pack it with you. You will be amazed at how much more water you will drink, when the water is right next to you.
Doing that helped how I felt and in return how I worked, dramaticaly. If your not feeling 100% your not goona be able to give 100% at work.
