I required knee surgery a few years ago; I prayed a lot before surgery asking God to guide the hands of all those in the theatre and to bring me safely out of the anesthetic. I apparently inhaled too deeply the anesthetic and had a hard time coming back into consciousness.
I remember being very frightened, as I did not want to die — I had so much more to live for. Immediately, a white light appeared and a voice encouraged me. It said, “Breathe, breathe, you can do it, you will come out of the anesthetic. Do not fight it.”
I know it was an angel of God speaking to me, so I can attest to angels being present all the time and having us always in their care. I have experienced it.
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Source : https://www.thoughts-about-god.com/angels/surgery.htm