I have had diarrhea for approximately a week and notice blood in stool for the past 3 days. i was on 3 different antibiotics back-to-back since nov13?

Stool culture: You need to have stool cultures sent by your doctor. An infection called Clostridium difficile is a very common infection after being on antibiotics. If this is what you have, you need to be treated. Doctor will likely send stool culture and also a special "C difficile toxin" test.

Stool studies?: Did your doctor perform stool studies on your diarrhea to figure out exactly what bacteria (or possibly virus?) is making you sick? Doing this may enable your doc to tailor the Antibiotics he/she is giving you to correctly kill the bug making you so sick. I may suspect Clostridium difficile if that many antibiotics were used last month. See your doc soon!

See doc: Blood in stool is not normal. Also diarrhea after three rounds of antibiotics could be a symptom for clostridium dificile, an antibiotic induced colitis, that can be serious. I would get seen today If you are dizzy, weak, or have fever: to ER

See below: Diarrhea can cause blood in the stool from bleeding hemorrhoids provoked by frequent bowel movements. Antibiotic Associated Diarrhea(AAD) is often self limited and due allergic or toxic effects of antibiotics on the bowel.More severe and persistent AAD is likely due to overgrowth of abnormal numbers of infectious bacteria,C. diff commonly,as well as others and Candida.Speak with yourDr for advice