No time right now, so just a quick reply to one thing. "Thorn in the flesh" IS figurative language. Obviously Paul did not have a real thorn sticking into his flesh. The question is what does the figure of speech mean. Scripture answers Scripture, and Paul was a Hebrew with Hebrew understanding, and the understanding of that figure of speech was that it meant people causing vexing, and problems, not a physical ailment.
Your other points can be addressed apart from the point about what "thorn in the flesh" clearly meant/means, as they are in other contexts.
What about Paul’s eyesight? Why was he not healed of that?