The anxiety neednt be withdrawal related so much as, living without alcohol related.
I am over 4 months sober and I still have extreme mood swings and anxiety attacks. Its getting better with time.
There is an article posted in 'Alcoholism' by Rowan that states at 90 days the effects of alcohol are gone from the brain.
http://www.soberrecovery.com/forums/...ion-brain.html