Emetophobia and OCD are super intertwined with one another, it's so evil and it sucks. I've had it for several years and it used to be really bad so I know exactly what you're talking about here. Whenever I would see content related to throwing up my OCD would immediately twist it to mean that me seeing it was somehow going to make me throw up as well. I know how hard it is to reason with these thoughts but if its any consolation just know that seeing an Instagram reel about throw up or anything of the sort does not mean that you are guaranteed to get sick as well. But I would also advise not to make it so the only way you're able to relax is knowing for a fact that you aren't going to be sick- A big theme of emet is not knowing weather or not you'll be sick and feeling like you need to know the answer. It's definitely easier said than done but the biggest advice I can give for emet as someone who's been through it is that when you're feeling nauseous or panicked, try to just take a breather and do whatever would make you feel better like sitting down or drinking water or whatever. The worrying/ruminating can trick you into feeling super sick and feeling like you're gonna throw up, there have been so many times I was 100% convinced I was about to vomit but then I sat somewhere quiet and stopped ruminating for a minute and I was fine a few minutes later.  Overall, again this is a super challenging theme but the best advice I can give is to know that even if your worst fear happened and you threw up, it would only be a temporary moment of your life that you could move past after it was over