You not alone on failing the first time around on the diet.
What cleanse did you do? Did it involve psyllium husks and the clay?
If you feel really ill after starting the diet; it is fairly normal and is die-off symptoms. Read the dangers of die-off post on the forum on assistance with dealing with this; I highly recommend using a sauna, steam room, or even hot bath to rid your body of the toxins during this period. It can completely reduce your symptoms if you have the time to do it.