I went to the doctor this past sunday with a sore throat and was put on penicillin for 10 days, the quick swab test came back negative, but there were white spots on the back of my throat. the sore throat immediately went away, but i've been feeling drowsy all week. I don't have a temperature, and later in the day i am not that drowsy. could it be the pencillin, i've also been working all week and haven't taken a day off, and even been working out at night. Why am i so drowsy?