Feeling of throat closing

[jinx70]

A couple of days ago I went to the ER. At some point I was given through my IV a mixture of Benadryl and morphine. All of a sudden I had a feeling my throat was closing and had a hard time taking breaths. Since I was able to get some words out, it was apparent I was getting O2. The doctor checked my throat for swelling and didn't find any. I was hooked-up to a heart monitor, and the machine went nuts. I have never had this happen. What could have been the cause?

[jinx70]

Hello, and thank you for your reply. I have received IV morphine on many occasions without incident, but have never received IV Benadryl. Thankfully my throat didn't actually close, though having that feeling is one I'll never forget.
I went to the ER with a severe headache, which involved near fainting and confusion. I can see being given Morphine, but what reason would I be given an IV mix of Morphine and Benadryl?
Thank you.

[Paderla Anitha, DNB]

Hello and hope you are doing well.

It could have been an allergic reaction to morphine or the preservatives used. I would suggest you obtain a referral to an allergist or an ENT who does allergy testing.  That is the only way to reliably know what is causing your allergic reaction.  Some allergies can be life-threatening as they can precipitate anaphylactic shock in which the swelling can be so severe that it impairs the ability to breathe.  Therefore, I would suggest you see someone as soon as possible.

Hope this helped and do keep us posted.