I have been a pet owner for many, many years. While I realize some people believe that vets are involved in a conspiracy to make more money, I feel that my pups would not have lived the long healthy lives they did without their knowledge, guidance and care.
In his defense, at least the OPs vet did not just willy nilly give a bunch of vaccines in that one visit. We all know that some vets who probably are not doing a lot of continuing education continue to give all vaccines together. While some people may think he did not wait long enough, and that can be debated, the point is he waited. He mentioned the flu vaccine to the OP and we have given our opinions; but she needs to read more about them and then go back and discuss this with her vet imho.
I am going to post one more link here that I believe is very important for the OP and anyone else wanting to know more about vaccines to read.
http://www.aahanet.org/resources/guidelines.aspx