Also, Benadryl is a trademark name, think of “grab me a Kleenex” when you want a facial tissue, yeah - diphenhydramine hydrochloride is available in a generic form.
Equate makes a 25mg version that is inexpensive but effective. Take a half-tab until you know what it will do to you - give it 45 mins. to an hour for full pull. When it kicks, it’ll do so abruptly.