The first few days, even the first week can be really rough, as your body is going through a massive adjustment without alcohol. It certainly was for me - I felt like I wanted to jump out of my skin and felt like a total trainwreck.
Be gentle with yourself, and make sure you are properly hydrated and most of all, remember you are not alone! There is a tremendous community of people here who care and have been through what you are experiencing.
Each day will get better and you will emerge a stronger, better YOU for doing this for yourself.