hahaha i also did a challenge like that with my friends, it was to last for our entire duration overseas without doing it. many people failed and it was hilarious, but in the end i can't say there was really that much negativity about it, the best thing was that after the duration it feels extremely relieving, and yes, it made many of us crazy for quite a few days.
I remember it was extremely difficult to go without, i was like a smoker, with cravings often so unbearable i was often worried of its effects, but now i think its fine, though i do it less these days, mainly due to having a girlfriend
. maybe getting one yourself might help you last the days. good luck!