End of Day 5 and still very hungry & weak

What's going on? In the past when I did this cleanse, I felt great by Day 5. But this time around, I'm hungry hungry hungry. I'm craving all kinds of food, especiallly cheese at this moment. I'm weak, no energy, and have various pains. The lemonade doesn't satisfy me like it did when I used to do this cleanse a couple years ago. I drink it and don't enjoy it, whereas I used to love it.