Call Your Doctor Now (night or day) If

• You feel weak or very sick
• Difficulty breathing and is not from a blocked or stuffy nose
• Fever of 103° F (39.4° C) or higher
• Signs of dehydration (e.g., no urine in more than 12 hours, very dry mouth, very lightheaded, etc.)
• New drooling (can't swallow fluids) or having great difficulty swallowing
• Unable to open mouth completely