Good Day. My husband is 62, very fit but takes copious quantities of Colon Cleanse daily. Thus, he averaged 3 evacuations per day. He has been stricken with severe abdominal pain, constipation and high blood pressure that spikes up to 212/121.Over the last 5 days, his body eeked out small amounts of black fluid only. CT scan came back fine, not even showing any feces/gas. ER diagnosed dehydration, constipation and abdominal pain - noted slightly elevated creatinine - and recommended a visit to the cardiologist, nephrologist and GI. At home, after taking magnesium citrate, he had "relief" - 4 episodes of very black liquid. Nothing solid has been eliminated. What could be wrong with my husband?