Dear Lisa,
Blood in stools unfortnately indicates the possibility of a bacterial diarrhea, and this is likely to worsen if prescription antibiotics are not taken to control it. I understand your problem, but I would advise seeing a doctor ASAP, so that further complications can be avoided..
OF course you need to continue taking the supporitive care (like fluids / yoghurt) in addition to the prescription medicines,
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Dr. Gupta