I Have Been Taking Metronidazole For 6 Days Now For

I have been taking metronidazole for 6 days now for possible giardia. Still awaiting results of stool sample. I have back and body aches and no energy. The diarrhea and nausea is mainly gone. I have 4 more days to go on the meds. Are my symptoms normal? Frustrated that I can't do very much because of my lack of energy. Thank you, Patricia