I was the living dead on my first couple of fasts. One of my coworkers was surprised when I was on my third fast that I actually behaved like a human. I wouldn't say it was a party but it seems to continue to get better each time.
I had some crazy detox, like pain like passing kidney stones. After relieving myself of the toxins the pain would disappear. A hot bath helped as well.
Go as long as you can and then break the fast carefully and immediately plan your next fast in the near future. It's tough having to work and not being able to rest and de-stress while fasting, but it's way better than nothing.