Go see your doctor. It's possible for a person to have an irregular opening between the bowel and the vagina, but it seems as though if you had such an opening, you would be having infections and material would come from the vagina that shouldn't be there. Go see your doctor and explain the problem, and get swabbed for infection.
So glad you found out. I should have thought of that, we do get lost-tampon questions on the site every now and then. [If you had said "dead meat" it might have occurred to me, since that's how other posters with lost-tampon problems have described the smell (lol).] Did you wind up going to the doctor? If so, that's smart, because if they thought things looked infected, they might want to give you a course of antibiotics. In any case, I'm happy for you that you got everything figured out.
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