A visit to your family doctor can be a great way to really commit. Admitting to your doctor that you're alcohol dependent can be a great tonic itself.
Not all alcoholics needs medication to safely withdraw, but no one here is qualified to advise you. Seeing your doctor can get you off to a great and safe start.
Sleep gets hard the first few weeks but gets better, easier and deeper once your body gets used to be free of organic solvent it has always had to metabolize! If you start a good program, the anxiety gets under control as well.
The best part of recovery, is you're not alone. We've all been through or are getting through the early days together. All the best!