Why do I have vaginal pain and discharge?

i tried to make an appointment with my gyno, but they were all full. Just to clarify english is not my first language so i can't describe everything the best. I'm over here dying of pain, I'm drinking pain meds just so i can function somewhat normal. I'm an 18 year old girl that's been sexually active for around 2 years or so with one partner and this is the first time that this happened. I can say that the pain started a few weeks ago while having intercourse and i felt a pain in my vagina during certain poses( missionary) but as soon as we switched that stopped so i ignored it. We just avoided it and everything was fine, until it started to burn while peeing. After that we had one intercourse during which everything was okay but the intense pain started later and it calmed down in a few mins. Day after that i woke up in the middle of a night because of the pain. Everything felt sore, was burning and itching. Especially around the opening (don't know what else to call it) and i couldn't touch that part, there even was a bump on it . Curiosity got the best of me so i looked with a mirror and i kinda stretched my vagina so i can se inside of it and everything inside was covered in white small chunks (size of rice) and they were really sticky. Also, it smelled funky, but not like fish and there were practically no discharge. Since it was the weekend i couldn't do anything because no one is working. It hurts to stand,sit, walk, litterally anything. I was barely moving. That lasted until yesterday, when i woke up i went to pee and i found a big piece of something on my underwear and it was yellowish green colour. I touched it and the only thing that came to my mind that it was like a piece of toilet paper or something like that . After that the pain reduced, it hurts sometimes and while peeing. I looked with the mirror again and there's no more white chunks and nothing hurts when i touch, also the bump is gone. Is it possible that somehow a piece of paper got inside of me while having intercourse, that he pushed it in with his penis? That it got stuck and came out by itself? If not, please tell me what to do, or how to ease the pain. Btw, gyno isn't working till monday????