Hello there,
thank you for posting your question on healthcare magic.
Your symptoms are quite suggestive of an
allergic reaction. Although I doubt this is due to
Benadryl as this drug is itself used to treat symptoms of
allergy.Although if you are sleeping too much due to the sedative effects of Benadryl,it can cause puffy eyes and face which is not a reaction to allergy.
The itchy sore eyes, puffy eyes and face and the rash ate all symptoms of an allergic reaction probably to cold, or the airconditioning or even to allergens in the air.
I suggest you switch to another antihistamine like
Cetrizine, one tablet before going to bed. Do not exceed the dose at any cost.Even though this is an over the counter drug, you should be careful as it can cause
drowsiness but not as much as Benadryl.
This should help with your symptoms.
Thank you for visiting healthcare magic