All of a sudden I feel tired all day and I have bad temple pressure and nausea. When it hits I feel flushed and the urge to vomit. Nothing is helping. Any thoughts?

Get a good physical. There can be many causes of this. Too many to address in this forum. Make an appointment with an adult doctor. An fp or internist & ask for thorough work up. The dr. Will want to take a complete health history & also know more about your tired/flushed feeling. How long, what makes it better/worse. What you have tried, any other medical history. Probably blood tests. Complete metabolic profile.