Another member of the class of Dec 09 here. Been sober for 3 days now. Not much time I know but I'm feeling good about it this time. I'm planning to go to my first NA meeting on Friday and maybe some more on Saturday and Sunday. If I can get past this first weekend without drinking/drugs I feel like I will have a lot more "momentum" behind me.
I don't really know much about recovery/addiction in general but one strategy I've learned to help with the anxiety and sleeplessness is to exercise as much as you can. It will help chill you out some during the day and keep your mind from racing as well as helping you sleep at night. I know it's hard to exercise when you're feeling like **** but trust me if you get out there and do it you will feel so much better after!