Is it normal to have diarhea-type black stools 2 weeks Post-Op?

I had an Open RNY and my gall bladder out on a Monday, and came home that Friday. I've been home for 7 days now. I'm on a full liquid diet. Everything I've had is sugar-free. About four nights ago, I had about three hours worth of very mushy BM's that were very black, with a slight red tint. Startled, I called my surgeon and he told me that if it was black, it was most likely old blood in the system. I used Imodium to stop the runs. Now it's about 4 days later, and I felt the need to go again. This time it's still very mushy, and very dark black, but it seems the red tint it gone. Can anyone tell me if they also had these very black movements, and for how many days after surgery did they last? I've had sugar-free yogurt, and pudding. Also chicken broth. Could any of these be causing the problem (milk has never been an issue before)? Thank you, and God bless.

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