i have a friend that has a addiction to a over the counter sleep aid diphenhydramine 25 mg for over 15 years she has bin takeing 13 of them for the high no less then 2 times a day could this be harming her she gos to the doctors yet her addiction she hides she gets chest pain offten her doctor dont see anything wrong with her heart but could something be wrong with her could this amount of diphenhydramine that she has bin takeing for over 15 years be covering something that could be wrong with her yet if her doctor knew this she would know what to look for