(Just realized how old this post is)
I was on buspar for a few months - the 1st time I took it I felt wonderful, but it really started to have no effect on my anxiety pretty quickly. Finding the meds that work for you can be so challenging.
After being on and off tons on anxiety meds I'm finally on what works for me - inderal (beta blocker - I get so shaky sometimes I can't put a pen to paper (had this long before alcohol so it's not withdrawal related)) and it helps a lot, escitalopram (antidepressant....never liked taking them since I don't suffer from depression, but it's helping) and clonazepam....... finding what works for you can be SO FRUSTRATING, but don't give up! And don't give up on therapy - cbt, act, and just chatting with someone you like that's really smart with mental health is so helpful!