This morning I had nausea and irregular bowel movements, my mother had diarrhea. Reason?

I was vaccinated 4 times against CoVid and also against the flu and flew home from an overseas trip to the island on on the 7th at 9 pm at night and I had cold symptoms the day after but recovered within 7 hours by drinking herbal tea with honey. Is it a virus? Corrupted dirty foods? colds? flus? Stomach flus? My mom also had diarrhea on the 6th too.

Flu
Virus
Food
Covid
Cold
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This morning I had nausea and irregular bowel movements, my mother had diarrhea. Reason?
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