Can't sleep afraid I'm going to throw up

I have an AWFUL fear of throwing up, nausea, and gagging. Seriously, I'd rather have 4 teeth pulled conscious (which I have had done, lol) than gag or vomit. Even seeing those words make me feel ill. I ate fine today but have been very anxious about throwing up for the past week or so so my stomach has been screwy. I feel like this all the time and never actually throw up (haven't since I was in middle school) but I never know whether or not this is actually the time it could happen. My stomach feels unsettled and I think I might have a little reflux. I keep having flashbacks to the last time I threw up and I'm about to cry. I hate the feeling and everything about the process. Please help?!? I really need sleep, I have to wake up in 5 hours 😭😭😭😭😭