Paul was not healed of his affliction. Whether it was sickness or whatever, there was no healing.
This thread wasn't supposed to be about healing though. Could we get back to the mistake of preaching only happiness?
OK let us look at the passage. Actually Paul told us what his thorn was, and it was not sickness.
2 Cor. 12:Therefore, in order to keep me from becoming conceited, I was given a thorn in my flesh, a messenger of Satan, to torment me. 8 Three times I pleaded with the Lord to take it away from me. 9 But he said to me, “My grace is sufficient for you, for my power is made perfect in weakness.” Therefore I will boast all the more gladly about my weaknesses, so that Christ’s power may rest on me. 10 That is why, for Christ’s sake, I delight in weaknesses, in insults, in hardships, in persecutions, in difficulties. For when I am weak, then I am strong.
A messenger from Satan,insults, hardship, persecutions,difficulties, these were his weaknesses, not sickness. Paul was beheaded for his faith. He did not die from sickness. Now look back in the book of Acts.
Acts 9:15 But the Lord said to Ananias, “Go! This man is my chosen instrument to proclaim my name to the Gentiles and their kings and to the people of Israel. 16 I will show him how much he must suffer for my name.”
Lord Jesus told Ananias that Saul/Paul was going to suffer much for His name sake.
2 Cor. 11:Whatever anyone else dares to boast about—I am speaking as a fool—I also dare to boast about. 22 Are they Hebrews? So am I. Are they Israelites? So am I. Are they Abraham’s descendants? So am I. 23 Are they servants of Christ? (I am out of my mind to talk like this.) I am more. I have worked much harder, been in prison more frequently, been flogged more severely, and been exposed to death again and again. 24 Five times I received from the Jews the forty lashes minus one. 25 Three times I was beaten with rods, once I was pelted with stones, three times I was shipwrecked, I spent a night and a day in the open sea, 26 I have been constantly on the move. I have been in danger from rivers, in danger from bandits, in danger from my fellow Jews, in danger from Gentiles; in danger in the city, in danger in the country, in danger at sea; and in danger from false believers. 27 I have labored and toiled and have often gone without sleep; I have known hunger and thirst and have often gone without food; I have been cold and naked. 28 Besides everything else, I face daily the pressure of my concern for all the churches. 29 Who is weak, and I do not feel weak? Who is led into sin, and I do not inwardly burn?
30 If I must boast, I will boast of the things that show my weakness. 31 The God and Father of the Lord Jesus, who is to be praised forever, knows that I am not lying. 32 In Damascus the governor under King Aretas had the city of the Damascenes guarded in order to arrest me. 33 But I was lowered in a basket from a window in the wall and slipped through his hands.
This is quite an extensive list of Paul's suffering, but not once did he mention sickness.