Hooberus,
If you look carefully at Revelation 22:6-8, you will notice that it was an angel, not Jesus, who told John, "Behold, I come quickly." So Jesus is not the only one who used that phrase as you seem to think. I doubt your intention is to prove that an angel is Almighty God!
And as I showed, reputable scholarship establishes that Revelation 22:12 is a quote from Isaiah 40:10. You seem too eager to ignore as of no consequence what others have arrived at through careful study.
You will note that the expressions "the first and the last" and "the beginning and the end" are not always associated with the phrase "Alpha and Omega."
Twice Jesus claims to be "the first and the last," and once God claims to be "the first and the last."
Twice God claims to be "the beginning and the end." Jesus never does.
Thrice God claims to be "the Alpha and the Omega." Jesus never does.
Look carefully at the context to see why Jesus claims to be "the first and the last." In Revelation 1:17, 18, he said "I was dead, and behold I am alive for ever and ever! And I hold the keys of death and Hades. " So, it seems obvious that he meant he was the first and last to be resurrected directly by the Father. God has thereafter authorized Jesus to be the one who raises the dead. (John 5:28, 29) And at Revelation 2:8, Jesus again mentions having been dead and then coming to life again. So, his being "the first and the last" has to do with something specific to his situation.
God the Father cannot die, so being "the first and the last" could not apply to him in the same way it applies to Jesus.
So I think you need to be more careful about how you apply the Scriptures. We can prove almost anything if we ignore the context.
Just as we have absolutely no basis for assuming that an angel is God simply because he claims he will come quickly, we have no reason at all to assume that Jesus is God simply because he uses an expression that his Father uses. God and Jesus cannot be "the first and the last" in the same sense of the expression because, as I mentioned, God cannot die and be resurrected.
Herk