Juice Fast: Day 3

I can't distinguish whether or not this is a stomach virus or if I'm that famished from having no solid food. I got up weak & dizzy and sick to my stomach. My ribs almost hurt! I spent a few minutes hugging the toilet bowl...gagged a little but nothing came up. I then laid on the cold bathroom floor for a few minutes until I was able to make it to the kitchen to grab my juice & water and now I'm on the couch. I'm thinking I haven't been drinking enough juice and my body is going into starvation mode. Today I plan to up my intake and see how that makes me feel. I've read up on this juice fasting and one of the bonuses is that it gives you energy. I'm sure not feelin it. I hope I can get this program tweaked just right because I do not like how I feel now.