
What Causes Diarrhea, Lower Back Pain, Loss Of Appetite And Foul Smelling Stools?

Gastroenteritis most likely
Detailed Answer:
Dear Ms, I have gone through your question and I understand your concerns
The bad odor of your diarrhea probably indicates the presence of diarrhea which could be bacterial or protozoal. I would recommend that you take Metronidazole (Flagyl) 400mg three times daily but if diarrhea did not improve then you will need to visit your doctor to get a prescription of an antibiotic to treat any possible bacterial infection.
The low back pain could be kidney pain which is induced by dehydration caused by diarrhea, so I would recommend that you stay away from NSAIDs and start increasing your daily fluid intake to compensate for the fluid lost due to diarrhea and prevent dehydration.
I hope I answered your question. Let me know if I can assist you further.
Regards

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