If he regurgitated less than a week ago then hopefully you fed him a very small mouse, as otherwise he'd likely regurgitate a normal-sized meal. I would give him two weeks before feeding again.
In the meantime get his heat where it needs to be, and definitely get the NutriBac reptile probiotic, you can find it at TheBeanFarm.com for about $10. Just dust a pinch on a damp f/t feeder.
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