Opening up to your counsellor might be cathartic and ease your burden Willow, I would start there. The other thing you could do is arrange trips and visits and things on your holiday in order to minimise proximity to any drinking and especially to any focused drinking ie going to bars etc. It helps to rehearse in your head what you are going to say if you are offered a drink so that it sounds emphatic. Holidays are a lot more enjoyable without a hangover.