fear of STD

Hello! something very strange is happening to me and i hope you will help me see more clearly.. i'm a 22 year old woman, i have never been pregnant or had any STDs (that i know of). i've been tested once. last thursday i had sex with a man i had sex with a year ago. we put a condom (probably several) but were very drunk. then we did it again friday morning, everything was normal except maybe i was a little sore. i left on a vacation last saturday. here is what's weird: twice now, while on the toilet i noticed a strange rubbery piece in my panties. first time was freaky, but i thought it was just something that got in my clothes. but this morning i realized it actually looked awfully like a piece of condom!! and smelled like it too. why are pieces of condom coming out of my vagina?? i have no memory of if ripping or getting stuck. but again i was drunk and fell asleep right after. the other thing is that two days ago, sunday, first my vagina felt a bit itchy then it passed. and then throughout the day i felt achy and my tonsils hurt. i had a terrible fever that night, and the next day i saw the doctor who confirmed it was tonsillitis. i'm now taking antibiotics which is making my vag discharge weird (not smelly but thick) but i think that's normal. anyway as soon as i get back i'm going to get tested for STDs. i read it is possible to get chlamydia in your throat after giving oral sex. do you think that could be what is happening to me? my tonsils are very swollen and painful, with white dots on them. apart from that i feel much better, just a little tired. also, do you have any advice? how do i know if there are any pieces left inside of me, and can they give me an infection?? thanks guys!:)