Hello, I've had nausea for 1 week, everyday, and vomited 1 time, on the 1st day the nausea started. Temp runs around 96.8 (no fever), have a slight headache like motion sickness. I have difficulty sleeping, get very hot at night but no sweats, just very hot. Sometimes have chills in the evenings (with 96.8 temp). I have no energy, and very tired in the evenings. One day within the last week, had a strong pressure in the middle of my chest which lasted 10 minutes. (no abdominal pain and no cramping, but do have mild diarrhea daily.) Also have had more gas (burping) more than usual. Dec 20-Dec 30--had cold with flu like symptoms--cough, congestion, sinus, aches. This just ended around Jan 5. The nausea started Jan 10, but other symptoms started in mid-December. Thinking this could be Gastroenteritis?? But I have no Abdominal pain and no fever and no dizziness. But do feel dehydrated some days. thanks for your advice! (I'm white female, age 55, no periods since May 2011) Thanks so much!