Buspirone
"For GAD I take 10mg once a day in the afternoon currently.  I've been on this dose for approx 2 months and the only side effect is bad lightheaded slightly dizzy feeling approx 30 minutes after taking it which lasts for 30min to 1 hour.  I was hoping it would go away after taking it for awhile but the dizziness comes on like clockwork after taking it.  It greatly helps my anxiety in the evening after taking it but my anxiety returns mid morning.  I'm not sure I could take a morning dose because of the side effect of being light headed for awhile.  If I could get past the dizziness this medication causes and get to a 10mg 2x a day I think it would greatly improve my GAD 24x7."