I woke up last night with an allergic reaction.  I took 2 benadryl before going to bed to help me sleep like i usually do and 2 hours later my hands itched like crazy then shortly after my face, ears, hands, and feet burned and itched.  Shortly after that i had hives all over my body so i took 3 more benadryl and went to the ER and they didnt know what could have caused my reaction.  And i didnt eat or take any medications out of the norm and have no history of food allergies.  Any idea on what might have caused my reaction?
HI, thanks for using Chat Doctor It would be difficult to know what caused your allergic response without a delayed history of anything you would have been in contact with yesterday. Since the reaction was so severe, you may want to consider allergy testing by your doctor. This can be in the form of blood tests or skin tests. They can check for a large range of allergies. When a person is exposed to some agent, they may not show an initial allergic response but as they are continually exposed and sensitized to it, allergies develop. I hope this helps