In the end, I think it's ok to feel a craving. We tend to panic and that can make the craving worse.
Just try and accept it for what it is - I found it best to keep busy, do things that engage you - and reaffirm your commitment to not drinking.
Cravings pass - you know you'll thank yourself later
The ideas in this link might be useful too SASA:
Overcoming Life's Obstacles: Urge Surfing to beat addictions and cravings
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