What Was Paul's "Angel of Satan"?

Paul's Second Epistle to the Corinthians 12:1-9

12:1 It is necessary to boast; nothing is to be gained by it, but
I will go on to visions and revelations of the Lord.

12:2 I know a person in Christ who fourteen years ago
was caught up to the third heaven--
whether in the body or out of the body I do not know; God knows.
12:3 And I know that such a person--
whether in the body or out of the body I do not know; God knows--
12:4 was caught up into Paradise
and heard things that are not to be told,
that no mortal is permitted to repeat.

12:5 On behalf of such a one I will boast,
but on my own behalf I will not boast, except of my weaknesses.
12:6 But if I wish to boast, I will not be a fool,
for I will be speaking the truth. But I refrain from it,
so that no one may think better of me
than what is seen in me or heard from me,
12:7 even considering
the exceptional character of the revelations.

Therefore, to keep me from being too elated,
a thorn was given me in the flesh,
an Angel of Satan to torment me,
to keep me from being too elated.
12:8 Three times I appealed to the Lord about this,
that it would leave me,
12:9 but he said to me,
"My grace is sufficient for you,
for power is made perfect in weakness."

* Compare this experience to the statement in Acts 22:17-18
that Paul "fell into a trance and saw Jesus."

**  Paul himself stated in the immediately preceding chapter, 2 Cor 11:14
that "even Satan disguises himself as an angel of light."

When Paul goes into his "trances,"
one wonders how accurately he is able to discern
when he may be speaking to Satan disguised as an "Angel of Light"

Why is the Greek word AGGELOS interpreted as "messenger"
in the English versions of 12:7, and not "angel"?

Biblegateway:

2 Cor 12:7 - "Messenger of Satan"

2 Cor 11:14 - "Angel of Light"

2 Cor 8:23 - Apostles are called "messengers"