question: I developed hives about 12 hours after washing my floor with bleach. By the time I finished cleaning, I knew it was too strong and went outside and got fresh air. I felt mild itching so I took a dose of Benedryl. 12 hours later, I woke up with hives and have been taking Benedryl every 4 hours. I have no throat pain and no difficulty breathing. It is now close to 36 hours since cleaning and the hives seem to be getting worse. Do I need to go to the ER?