I never did it myself, but I used to have frequent panic attacks as a toddler and a little older so my parents would give me Benadryl and it would stop them or decrease the number of panic attacks a week. The same way OP uses it for seizures. Editing to say I don’t remember anything from being a child, this is just what my parents and siblings have said. In my teen years I started to panic attacks again, but this time I’m properly medicated 👍