Wait three weeks before feeding again and in the meantime purchase some NutriBAC reptile probiotic. You can find it on Amazon. It's a powder, just dust a tiny pinch of it on a damp f/t feeder to help replenish your snake's gut flora after a regurge or course of antibiotic treatment.
When you do offer food again it should be a tiny feeder, something like a damp f/t mouse fuzzy dusted with NutriBAC.
Then wait two weeks before feeding again, and offer another damp f/t mouse fuzzy dusted with NutriBAC.
If all goes well you can slowly start increasing feeder size and decreasing the time between feedings. I would not feed more often than every seven days though.
Finally, if your snake regurges again take it to a vet that specializes in exotics and have it checked for parasites.