A lot of the anxiety and sleeplessness is from your body readjusting to the absence of all the foriegn chemicals. It took me quite a while to finally get a good night's sleep, probably a month. Part of that was physical and part of that was mental. I was very jittery and my mood swings were just horrendous. It has gotten a lot better.
This is a point where I diverge from a lot of AA's and that is on the issue of meds. If you are taking them as prescribed under a doctor's supervision that can help, however, I did have some bad experiences with Klonopin especially and to an extent with Xanax (I don't take either at this point). I never took Valium except when a buddy had a couple extras he wanted to sell me so I can't say much about that
Part of the issue with me was identifying which symptoms were withdrawl symptoms and which ones were part of my overall mental illness (another issue entirely) and taking action accordingly.
Anyhow, keep it up! 13 days is a long time. It really does get better!
Hope that made sense, I'm at work trying to eat lunch and reading the boards.
Tim