Since you are still transitioning into this new lifestyle, along with weight loss and increased exercise, I would be tempted to suggest you eat something low carb (say a nut bar or a chunk of cheese) half an hour before you experience this daily carb craving.
Having said that, you haven't stated what you are doing, and what you are eating at the moment, to deal with your daily afternoon craving. Are you eating carbs? (in which case your body will be wanting, expecting and demanding more the next day, and the next...) Or are you ignoring the craving? (in which case your body will adjust over time, but it won't be enjoyable) Or are you eating low carb instead of carbs in response to the craving? (which would help to teach your body a new expectation).
I am prone to hypos with stress, exercise, and as a knock on from too many carbs, so I know how unpleasant they can be. But over time I have learned that for me it is far better to avoid them completely by altering my routines (bigger lower carb lunch, or a snack before the hypo starts), rather than waiting for them to happen and treating them - which often ends up as over-treating them.
Hope that helps.