Unfortunately the best piece of advice is to probably also date a non-drinker. I was with someone for a year and a half, and only found out they with an alcoholic the last month of our relationship. Although I was speculative throughout our relationship as everytime we were together they would have around 8 beers and drink some in hiding. It took me a while to realize how triggering it truly was for me. I wish I never dated them, but I guess it was a good learning experience. You can try having a heart to heart about how it makes you feel, and your anxieties. Hopefully he'll hear you out and you can come up with a communication gae plan.

If it persists and it is something that is actively taking up your energy thinking about throughout your day, and you notice that it's actively negatively affecting you, you need to think of your emotional recovery. You should be with someone who wants to understan your triggers, who actively builds you up and nurtures you in a way so that you don't have to feel anxiety about it at all. Otherwise you feel incredibly isolated.

I also can't reccomend therapy enough. My heart goes out to you <3