What kind of sickness do people have if the person barfs has headaches and faints?

The symptoms you described could be caused by different medical conditions, so it is important to consult a doctor for a proper diagnosis. However, some possible illnesses or conditions that may cause vomiting, headaches, and fainting include:

1. Concussion or Traumatic Brain Injury: A head injury, such as a concussion, can lead to symptoms like nausea, vomiting, headaches, dizziness, and fainting.

2. Migraines: Severe migraines can cause intense headaches accompanied by nausea, vomiting, and sometimes fainting episodes.

3. Meniere's Disease: This inner ear disorder affects balance and hearing. It can cause dizziness, vertigo, hearing loss, tinnitus (ringing in the ears), and sometimes nausea and vomiting.

4. Food Poisoning: Consuming contaminated food can lead to food poisoning, causing symptoms such as vomiting, diarrhea, abdominal pain, headaches, and in some cases, fainting due to dehydration.

5. Viral or Bacterial Infections: Some viral or bacterial infections, such as gastroenteritis (stomach flu), can cause vomiting, diarrhea, headaches, and fatigue. In severe cases, dehydration can lead to fainting.

6. Heat Stroke or Heat Exhaustion: Prolonged exposure to extreme heat can cause heat-related illnesses, which may lead to symptoms like dizziness, headaches, nausea, vomiting, and fainting.

7. Neurological Disorders: Certain neurological conditions, such as epilepsy or vestibular disorders, can cause episodes of fainting, headaches, and associated symptoms.

8. Medication Side Effects: Some medications or their side effects can include vomiting, headaches, and dizziness, which may lead to fainting in certain individuals.

Again, it is crucial to seek professional medical advice for an accurate diagnosis and appropriate treatment. The doctor will conduct a thorough evaluation, consider your symptoms, medical history, and may recommend additional tests or imaging studies if necessary. Self-diagnosis and treatment can be dangerous, so always consult a healthcare provider.