First-time faster...frustrated

Hi! I was surfing the net and stumbled on this little community. Nice to meet you! I am on day 8 of my first juice fast. My goal is 30 days. I have lost exactly TWO pounds. How is that possible? I weighed myself for the first time today, and it's so discouraging. I am taking in no more than 400-500 calories per day in juice, and drinking 8-10 glasses of water every day. Up until this morning, I was feeling pretty good. Today, I actually feel awful, which just makes the pathetic weight loss that much worse. My stomach hurts (cramping) and I have a headache. I want to quit. I need some encouragement. Will this get better?