I feel the same. I am starting tomorrow. My body feels used and abused from poor eating habbits and it is now showing up in other forms such as achy muscles and joints, mild arthritis, serious back pain, poor sleep patterns, IBS, Bursitis....so on and so on. I am only 36, I shouldn't feel like this. I feel too tired most of the time to even go to the park with my 4 year old.
This is my first fast. No idea if I can do it. I am a caffiene addict and also smoke a pack a day. Pretty healthy eater (just eat too much). Quiting all tomorrow. Feeling very nervous. How did you feel today? Hungry? Tired? Agitated? I will be watching for your posts to see how you do - one day ahead of me.