In some cases, headache and nausea are signs of a serious underlying health condition. You should seek immediate medical attention if you experience a very severe headache, if your headache and nausea worsen over time, or if you experience any of these symptoms along with your headache and nausea: slurred speech ; confusion; dizziness
Drinking milk before bedtime is a folk remedy for people who suffer from acid reflux and heartburn during the night. Milk has a soothing effect on the stomach and throat, providing temporary relief. But milk also has a rebound effect that can cause heartburn later.
Others think that the acid helps balance acid production in the stomach or that it might help buffer the acidity level in the stomach because acetic acid (the main component of apple cider vinegar) is a weaker acid than hydrochloric acid (the acid produced by your stomach).