That sounds scary. I have allergic reactions like that sometimes, too. I've learned recently that the newer generation drugs are better than Benadryl, mostly because they have fewer side effects.
One of the recent articles on it - https://drrubin.substack.com/p/why-it-is-time-to-move-on-from-benadryl?publication_id=1310697&post_id=160583620&isFreemail=true&r=1lnsqh&triedRedirect=true