Sanashankar,Your dating of the epistles puts Galatians after the writing of the letters to the Thessalonians. I disagree. I agree with the scholars who put it before the council of Jerusalem. There is a line of scholarship in the 1800's which argues that Paul and James were at odds with one another. Some people would try to make Paul's visit to Jerusalem in Acts the Jerusalem council and try to make Paul at odds with James teaching on Gentiles. This unnecessarily puts the apostles at odds with each other.
Part of the problem is that scholars in the 1800's did not realize that some of the so-called 'firt missionary journey' churches mentioned in Acts 13-14 were actually in the Roman province of Galatia. The border of Galatia was moved up from the coast and the southern portion was included in another province within a couple of centuries after Paul, and some of the scholars only knew of that geographical division. I've read commentaries that Paul's visit to Galatia must have been made some time not mentioned in scripture. There is a tradition that he went way up to Ankara. It doesn't make as much sense though. Right after Acts 15, Paul takes the letter from the churches to the churches of Galatia. They were already in existence before Acts 15.
The meeting with Peter, John, and James the Lord's brother does not seem to be a good match for the Acts 15 event. If he had a letter from the apostles about Gentiles indicating the other apostles did not perceive the Spirit required them to be Jewish, why would he not mention it? The liberal theologians may want to make him oppose the letter, but Acts shows he delivered it, even to the Galatians.
No, the south Galatia theory makes a lot more sense. This is the scenario I see. Paul was in Antioch. Peter came and stopped eating with the Gentiles when some James sent some conservative Jewish folks. Peter rebuked him. Paul either hadn't gone to Galatia yet or had come back and hadn't gone up to Jerusalem for Acts 15. Paul writes this letter to the Galatians. Then a group of Gentile circumcision promoters show up in Antioch. Paul and Barnabas, who were already companions from their first journey argue with them. God to Jerusalem. Then they decide to read the letter to the churches. They split up over what to do about Mark. Barnabas and Mark go to Cyprus. Silas, who went to Antioch after the Jerusalem council, goes with Paul on the so-called 'Second missionary journey.'
Anyway, my point is that Paul got sick EARLY in his ministry.
Galatians 4
13 As you know, it was because of an illness that I first preached the gospel to you, 14 and even though my illness was a trial to you, you did not treat me with contempt or scorn. Instead, you welcomed me as if I were an angel of God, as if I were Christ Jesus himself. 15 Where, then, is your blessing of me now? I can testify that, if you could have done so, you would have torn out your eyes and given them to me.
(NIV)
(emphasis mine)
Even in your list, his ministry in Thessalonica is still pretty early. Galatians is written before his ministry in Ephesus where he does all the great miracles in your chronology as well.
Lots of people were healed through Paul, but sometimes he or his companions had to deal with illness whether early in his ministry or late in his ministry. Sometimes God heals the slow 'natural' way.