When I did my first Master-Cleanse I did get flack from the people I worked with. They thought I was crazy for trying to go with out food for 10 days. When I finished, they all praised me for doing it... I got sick on day two of my first MC, I was nauseous in the afternoon and actually felt better when I finally brought it back up. From then on it was easy to do the MC...
Hang in there... you will get past this.. I am doing my second Master-Cleanse and I am on day two. I actually feel great. YOu will too... :-)