The first week is the roughest. My day 2 my first cleanse was definitely like yours and I spent the day in bed! All really normal so do not worry.
It does definitely sound like you need more water and like another poster suggested, the SWF (Salt-Water-Flush) helps move the toxins loosened by the lemonade drink.
If your systems get too severe, an enema can help. Even a simple FLEET one is beneficial.