Thank for asking to HCM
I really appreciate your concern the given history here is suggestive of Gastro enteritis
and in my opinion this condition need to be treated with the following medicines,
1) Tab Doxycycline 100 mg once in day
2) Tab Metronidazole
400 mg twice in day
you have to continue this regime for 7 days, no need to worry every thing would be fine soon, have nice day.