I want my boyfriend to temporarily stop drinking
Why do you want him to stop drinking?
I am allergic to alcohol, and it is hard to be around him at times.
You should bring it up with him as soon as you can. If it is harmful to your health, it is imperative that he knows soon.
I thought about saying: hey asshole stop drinking!
I think calling him a name to get him to stop drinking for you medical condition is a bit too far. You know if he is addicted he might want to break up and be with someone who can deal with his drinking.