Well done, it's a wonderful first step you have taken.
I second the sweets and juice. Honestly, don't worry about food too much, have whatever you fancy, whether it's sweets or oatmeal.
My DH has been sober in AA for well over a year now, and he said that someone once said at a meeting "I've stopped drinking, but I"m eating 5 kitkats every day" and someone said "until you're waking up in the park, surrounded by kit kat wrappers with no memory of how you got there, it's probably ok".
When DH first stopped drinking he would sit and eat a whole pack of sweets in an evening, and still lost weight - now, over a year later he eats a perfectly normal diet (although he can still go through a whole pack of Tim Tams, but who among us can say they haven't?)
You're doing great, you've turned an amazing corner in just admitting that you have a problem and seeking help. Many people will never be able to do that.
My DH found that throwing himself into AA really was the way to go - meeting every day, put life on hold for the time being, taking other members' phone numbers so you have a lifeline if you think you're going to drink. Then over time, find a sponsor, start doing the steps.
DH is a changed man (well, he's an improved version of the wonderful man I married!) but he is no longer anxious, he is confident, happy, very self aware.
You're doing so well, good luck with it.