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This is Dr. David
you should go to the ER because of a week of diarrhea.
they can test your stools there for clostridium difficile infection
you could be dehydrated and you most likely will need IV fluids.
long term diarrhea can cause low potassium and electrolyte imbalances in your blood
you don't want to get dehydrated from persistent diarrhea.
the ER doctors can prescribe stronger medications for you
do you have a hospital or ER close to you?
do you have other questions?