<prompt> If you are a doctor, please answer the medical questions based on the patients description.I woke up feeling nauseous and was extremely hot and my heart was racing. This feeling subsided in about 20-30 minutes. Ive been feeling bloated and gassy for the past few days and I have no idea what the possibilities are. I did take penicillin at the beginning of January and finished taking them on the 20th. Perhaps it messed up with my flora? Also, I am on birth control but haven t been taking it at the same time everyday I haven t missed a pill though. I haven t show any other symptoms other than those. I m really starting to fear that I may be pregnant. I m not getting my period for another week and a half.  <response>: Hello, I would explain that your symptoms could be related to acid reflux. Anyway, I would recommend performing some tests in order to investigate for other possible causes:- a resting ECG.- an abdominal ultrasound and a pregnancy test considering the delay in your menstrual cycle- complete blood count for anemia-blood test or stool test for Helicobacter Pylori-thyroid hormone levels for thyroid gland dysfunction. You should discuss with your doctor on the above tests. Hope I have answered your query. Let me know if I can assist you further. Wish you good health. 