I am on day 4 also. This is my second cleanse. I did a 12 day cleanse back in January and it helped me immensely although I did not realize it at the time.
Prior to my first cleanse I experienced chest pain, muscle pain, back pain, flushing, muscle twitching, etc.
After the first cleanse I had a little aching in my left side that was relieved by a liver flush.
I did not realize how much the first cleanse helped until all of the aches and pains slowly returned over the summer months.
This one is much easier because I know it will help.
Good luck and stick it out. The unpleasantness is defientely part of the detox.