Heavy Drinker quitts suddenly

I need some advice. My 51 year old spouse quit drinking after 10 years maybe more. He used to drink about a bottle of whiskey a day. A pint at least. It’s been about two weeks now. He’s seems to be okay.
What worries me is the confusion and the anxiety. He is also sweating a lot and has no appetite. Insomnia is also present. What can I do to be more supportive ?