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Hello this is Dr. Salama MD,
Thank you for describing his symptoms so well.
Yes, it does in fact sound like he has developed an allergic reaction.
I would not take any more of the benadryl at this time since 50mg is the max dose at any one time.
I am especially concerned about the tongue swelling and sore throat which he complains of as it could further develop into issues with his breathing and become more serious.
He needs to go to the ER asap to have stronger medication administered to relieve his remaining symptoms and secure his airway appropriately.
Let me know if you have any other questions.
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