Welcome shanchuy - Congratulations for deciding to get sober! It's good that you went to the doctor and are reaching out for support. That's a great start.....
I was really scared, too, when I first got sober. The first few days seemed to drag on forever. I spent a lot of time reading here and just trying to make it through the day. It gets better - it really does.
I also took Vitamin B Complex (alcohol destroys a lot of B vitamins, especially Folic Acid), and ate really well. Snacking can keep your blood sugar from dropping, which often feels like a craving.
It will take some time to adjust, but if we can do it, so can you!