Hi, I was on a triple mix cocktail of strong antibiotics for h pylori as well as amoebiasis (parasite). I felt good when I was on the antibiotics, had solid BM's - the first in a year. When I finished them, I started to feel worse & now (same as you) have abdominal bloating every day, feel awful, abdominal tenderness and backache. And soft, dark stools. Some diarrhea as well.
Did you figure out what was going on with you? I'm trying everything, including food elimination but am sooooo hungry!