Hello and thanks for trusting me to help you. I am a board certified consultant with over 30 years of experience.
I understand your concern.
Black colour stools can be due to upper GI bleed.
Also it can be due to medication intake like pepto-bismol.
Liver Function Test may be required.
Ultrasound of whole abdomen may be done as well.
This can be viral infection as well.
Oral Rehydration Solution may be helpful.
Probiotic can be helpful.
Let me know if you have any further query so we can discuss it thoroughly in every aspect.
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