Stomach cramps are not good, that's not natural healing crisis reaction, that's just a reaction. Perhaps you need to stop the SWF (Salt-Water-Flush) for a day or two, and stop the senna tea if you're taking that. Give your stomach/colon a break. Drink more water and less of the lemonade drinks too.
If you are otherwise feeling great, keep it up! The longer you go the more benefits you get. :) I just don't like the sound of that cramping, that's not right. Listen to you body, it knows best! :)