I have been having that problem, too. I was having really soft stools, going 4-6 times a day, but now, it's brown/black & hard, little small pieces. It's crazy how you change back & forth one day from going so much to not hardly at all. I am on pain meds, too, but I was before when it was frequent, too, so it doesn't make any sense to me. One surgeon I saw said if it's not BLACK BLACK, but brownish black, or with black parts, it's not from bleeding. I don't know if that's true, though.
Live for today, for tomorrow you might just get hit by a semi.