This is a solve-it mystery at this point 😑 PLEASE HELP ME OUT

It all started when I lost my virginity last year on August. We used condoms the first few times until I got on birth control that same month. After that we didn’t. The following months, my discharge changed to a yellow- almost greenish color along with itchiness and swelling. So I took Monistat 1 Day thinking that what I had was probably a yeast infection.. As a result, it probably worked for a week but then it came back. Then I took monistat 7 Days. It did the same, it came back shortly after. Then I contacted my Pediatrician (I’ve never been to an Gynecologist before) I told her what was happening and she sent me a pill that your suppose to take once and it should cure you.... IT didn’t... so I went to the doctor again and I took a urine test and she had a look down there, got a swab and got some of my discharge on it and then sent it to the lab. Then she gave two perscriptions “amoxicillin” and some other one to take for two weeks. After 72 hours i called and the results where “normal”. Everything was okay. BUT OBVIOUSLY ITS NOT!! Anyway I have no idea what to do and btw I had sex yesterday (unprotected) and the picture was taken today. PLEASE PLEASE HELP ME OUT PLEASE I promise, usuing condoms vs. not doing is not proving to be effective in this case. After the first time I encountered this problem, I started to use condoms for about 4 months and within that time frame, I still had them every single time after I had sex the day prior. IDK WHAT IS GOING ON