What evidence is there for what happened to Saint Paul?

The most famous event said to have happened to Paul was the miraculous event when he was blinded by a light and heard a heavenly voice, leading to his conversion to Christianity at Damascus. This is an account that comes only from Acts, with no hint of it in Paul's own writings. In fact Paul's own account of his mission, written long before Acts, is so much at variance with the story in acts as to cast serious doubt on it, for this reason alone. Paul own account of his conversion is in Galatians 1:15-17:

But when it pleased God, who separated me from my mother's womb, and called me by his grace, to reveal his Son in me, that I might preach among the heathen; immediately I conferred not with flesh and blood, neither went I up to Jerusalem to them which were apostles before me; but I went into Arabia and returned again unto Damascus.

Acts has three mutually incompatible versions, that theologists and scholars have struggled to reconcile. In the first two cases, Paul went immediately to Damascus and, since he was blinded by the light, the disciple Ananius miraculously cured him and gave him baptism. In the third case, it is strongly implied that he went first to Damascus, but a sojourn in Arabia need not be ruled out. Acts of the Apostles shows evidence that the author knew of Paul's own account in the epistles, yet the author continues to rewrite history to suit his own agenda. For example, Paul said that when in Damascus preaching to the gentiles, he escaped from the king's guard by being lowered from a window in a basket. Acts says that he was preaching to Jews, since Peter had not yet proposed converting the gentiles, and that he escaped from the Jews by being lowered from a window in a basket. Nothing in Acts of the Apostles should be accepted as literally true without corroboration.

There is no evidence for what happened to Saint Paul in Acts of the Apostles.