Is it normal to have black poop along with constipation?

I'm 5 1/2 weeks post-op from open RNY (distal) and this morning I went to the bathroom and was severely constipated. After about 40 minutes or so, I FINALLY got the &*$^ sucker out and it was BLACK! Could this be related to my vitamins? I'm getting in 8 Vita4Life per day (though according to the pkg., I'm supposed to be taking 12/day), and I'm taking 1 iron pill (Fergon) per day, which is 325mg. Or does the black poop indicate that I am bleeding inside? I'm still feeling light-headed and cold-sweat-like when I'm up & about for too long. It's like I have to bring a folding chair with me where ever I go. PLEASE TELL ME THIS IS *NOT* INTERNAL BLEEDING!!! But if it is, how do they fix it? With surgery?

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