Am I overreacting?

I took my 1y2m Bernese to a vet (which is very hard to schedule an appointment in my location) but to see a specialist in behavioral health. He bit someone and I needed an assessment. In his file, they mentioned he is an aggressive dog with aggressive tendencies and they prescribed him with fluoxetine. But here is the thing, we only talked to a tech vet and then later a general vet stepped in and did not mention anything new and said they'd call with news on prescription.

We decided to go after a psych specialist who requested a few exams (including x ray in case my dog is in pain) and gave us great support.

The dog is kind and loves kids and our cats. He doesn't like crowd areas (it makes him nervous and in a vigilant mode) .

I requested a refund from the clinic since they also confirmed they didn't provide behavioral test (they didn't say that when we tried scheduling in the beginning) and we mentioned the psychologist recommended us not to give our dog the anti depressant.

Did I overreact by requesting a refund?