Call Your Doctor Now (night or day) If

• You feel weak or very sick
• Fever of 103 F (39.4 C) or higher
• Signs of dehydration (e.g. no urine in more than 12 hours, very dry mouth, lightheaded, etc.)
• Severe abdominal pain
• Constant abdominal pain for more than 2 hours
• Bloody bowel movements
• Black bowel movements
• More than 10 diarrhea stools in the past 24 hours