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This is Dr. David
you could be having an allergic reaction causing the tongue swelling.
this can become very serious very quickly
swelling tongue can cause blockage of your airway.
yes, you can take a benadryl
but you should go to the ER and see a doctor
to see if you need steroid medications.
and see if you need an epi injection.
you haven't taken an antihistamine (or benadryl) yet?
are you having trouble breathing or swallowing?