15 pound weight loss creeping up

over the past couple of weeks I've put back on five pounds. this isn't just the up and down swing while losing weight. i'm trying to get back in the mode, but am having trouble. i lost the weight by just one day deicding to stop eating -- not really stopping, but really cutting back and being very conscientious about journaling. a radical departure for me. i guess i'm just looking for support to get back on the horse again.