Feeling in the back of my throat

So my boyfriend and I are “enjoying” Valentine’s Day and I swallow his stuff right? Well ever since then it feels like I have throw up in the back of my throat. I feel nauseous and when I burp it’s all wet🤢I’m not pregnant because I’m on birth control and we used condoms so I know that’s not an option we’re always safe but I googled my symptoms and it said it could be acid reflux. This has never happened before so idk what to do I’ve been drinking water and making sure I’m on a balanced diet but DAMN this feeling just won’t go away any advice? And has this ever happened to you? Do you think it could be something wrong with him?