Sorry to hear you are not feeling well. Have you been using your lax tea each evening and your SWF (Salt-Water-Flush) each morning?? Also, how were your bowel habits prior to beginning your cleanse??
If this were my problem and I could feel the blockage, I would probably do a colonic. If you have a good therapist you can go to, certainly it would be appropriate. I know Somer has shared that she goes every nine days on her extended fasting with lots of success.
Have you been getting in your minimum or more of lemonade each day?? and how about half your body weight in ounces of water??
I am going to venture a guess that you could also be dehydrated. The phantom backache could be associated with your gallbladder. You will most likely want to do a Liver Flush after you are done with your cleanse.