Thanks for the reply. It's morning and I feel better now that I slept. My job is pretty physically demanding and I think it's just very hard on me to fast when I am heavy lifting things all day and having to move around a lot. The thing is, day 4 was the happiest day I've had in awhile; I felt such bliss and peace with everything in the universe. I was 'in the zone' with fasting; I felt very content and thought I could continue on. But on day five, it was like I was a different person then the previous day. I felt completely different in my head; like I couldn't remember WHY I was fasting at all.
I think what I'm going to do is fast again next month. One fasting attempt a month sounds safe to me. In the meantime I get to eat all my favorite fruits and be physically active.