Did ye suffer? (epathetė). Second aorist active indicative of paschō, to experience good or ill. But alone, as here, it often means to suffer ill (tosauta, so many things). In North Galatia we have no record of persecutions, but we do have records for South Galatia (Act 14:2, Act 14:5, Act 14:19, Act 14:22).
If it be indeed in vain (ei ge kai eikēi). On eikēi see note on 1Co 15:2; note on Gal 4:11. Paul clings to hope about them with alternative fears.