<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I have been experiencing shortness of breath, difficulty breathing, fever, and vomiting. Can you tell me whats wrong with me?  <response>: Based on your symptoms, it sounds like you may be suffering from croup. Its a viral infection that affects your upper airways including your voice box and windpipe, and its most common in children under the age of six. 