Re: Tetracycline
Dark circles under the eyes are associated with the colon. I recently was in a bowel clinic supporting a friend and it was noticeable to me that many of the patients had dark circles. Constipation is associated with a dysfunctional biliary system and also bowel overgrowth and overload.
This suggest to me that you may have two possible problem areas.
1. The colon. With overload it is recommended to reduce the amount of non-soluble fibre. That is skins and seeds the type of foods that just don't digest but give bacteria plenty of roughage to ferment and of course fibre makes a good stool. You could try reducing the amount of fibre a little at a time to see if makes any difference.
2. The biliary route, including the liver, bile ducts, gallbladder and also intestines. The liver is the primary digestive organ and it makes sense to have it in good working order. It can take more than 7 flushes how many I don't know, to clear any contamination or dysfunction. I don't think that 7 is a fair test and the cleanse may not kick in until 12 to 20 (Just a guess). A guy has posted today that he did 40 over three years to get clean.
I'm not sure about the tetracycline connection but it may have an adverse effect if the digestive system wasn't resilient in the first place.