It appears that Paul's infirmity at this time may have been in his eyes or eye sight. Remember that his eyes at one time had been blinded and scaled over by the light of the Lord's glory.
Notice the passion with which Paul speaks of/to the Galatians as he extols the difference between the two covenants, how they are not to be inter-mingled.
2012 - pBiblx2 Field Wise Bible System Version 2.0.9d - GPL3