I had the same problem on days 6 and 7. And just this morning, I found the culprit of the problem. After 7 days of almost no bowel movement, this morning I had to go really bad after the salt water flush. Guess what came out? It was absolutely disgusting! It took the form of stool but when you look closely it was a HUGE worm! Now, I'm not experiencing any of that indigestion. So, I'm not sure if it's the same case with you, but my guess is it's a parasite!