You are smack in the middle of the "best" part. You're quite right in that the toxins have started to push themselves out. Your skin, cravings, and even your blues are all the result of the toxins swirling around you. Think of it this way: these are the substances that make you feel bad in the first place, not just when you cleanse. Have a big swig of water and get 'em outta there!
Don't give up. You're stronger than all those toxins. As you go in the cleanse, food is always going to be a huge factor. I still get cravings everyday. It's good that you noticed you want food even tho you're not hungry. Once you finish the cleanse you can remember that insight when you DO want to eat everything in sight.
Listen to your body. Surrender to the process. You're doing a great job! :-)