I'm no doctor wolfsong, but are there walk-in clinics where you live? Maybe that wouldn't seem as dramatic as going to ER and you would be more comfortable with the idea. They would send you to ER if they thought it necessary. Your age of course is a consideration as well. If you are young, chances are good it is stress. If you are older, well that could be another matter. Do you have a neighbor or friend you could call if you don't have gas in your car? Hope your symptoms pass quickly.