2 weeks after my last unprotected encounter, i have been experiencing drowsiness, and between 7pm and 8PM i start to get really sleepy which is not my usual. It's 4PM and the whole day today i feel like i wanted to lie down and sleep. i remember going to sleep last night at 8pm and waking up at 4am today. I think that is enough sleep, yet it feels like i wanted more. Could it be because of antibiotics (i'm taking amoxicillin and Diclofenac sodium as prescribed by doctor) or could it be possibly because of STD? i've yet to see the results of my urinalysis and have it checked by my doctor. i will also ask for specific STD tests by this weekend. please help. thanks.