Okay so I'm 20 years old and recently immediately after eating I have thrown up all the food I had just ate but it doesn't happen every time....only after a couple foods I've eaten. I don't feel any discomfort or nausea after either. My breast have been sore lately and I'm a few days late on my period hence why I'm asking this question. I have been tires more than usual and also have made many trips to the bathroom more than usual. So could I be?