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.