Congratulations! You got a good reason to be proud of yourself. I was/am an alcoholic and it's the truth that body craving for substances makes one experiencing those symptoms you mention. If i see free alcohol serving, like in an airport lounge, i start feeling quite anxious because my body knows that if it can trick me to get some relief, it'll get some alcohol and so... gets me drinking easily to get some relief for "fake anxiety".

I think first few weeks are easy as you need just some self discipline but the real hell starts from there. I have no idea how long you've been sober but i'd recommend do search some peer support- It's easy to quit and relapse alone...