If your allergy is specifically to wheat and you're not celiac/gluten-intolerant, you might be okay with several styles, since wheat is more of an adjunct ingredient in beer and not essential to a lot of recipes.  On that note, definitely stay away from "weiss" style beers.  Bottom line is you'd probably need to ask, though (both your doctor and the brewery).  My knowledge is only based on a small homebrewing hobby and I cold be overlooking something.  Unless you're talking to the brewers themselves, servers' knowledge of ingredients can be mixed.