Hoping that some of you may have some sage advice! Started the CAP in November, NAC (up to 1200 2/day), then doxy 100 mg 1/day, then azithro 250 mg M, W, F). Last Sunday upped the Doxy to 100 mg 2/day. Throughout this had no reaction until yesterday, when I experienced mostly gastointestinal problems (pain, discomfort) as well as pain in lower back and neck. Felt sick enough to go to bed. Unless a result of a tummy bug, I suspected perhaps porphyria. Last night I took 5 chlorella (1000 mg) and this am. took 2 activated charcoal 250 mg. for the first time, keeping it low until I see how I tolerate it. 1. Does this sound like porphyria symptoms?2. If it gets bad like yesterday (and I don't want to miss work), is it advisable to ramp back down on the doxy for a few days to 100 mg/day or is it not a good idea to go backwards?3. Is charcoal the best remedy if porphyria is my problem or are there other non-prescription moppers that others have found very helpful? How much and how often do people find is needed of activated charcoal to moderate the symptoms without ending up with constipation problems?Thanks for helping!! Regards, Len.