My family doctor prescribed SNRI Pristiq. I've been on it for 24 days and I don't feel any different. My phsiciatrist prescribed SSRI Fluvoxamine because Pristiq hasn't helped. Should I give Pristiq more time? Or should I listen to my psychiatrist?

I'm taking medication mostly for social anxiety but also OCD. 

I know SNRIs tend to have better results which is why I'm hesitant to leave it. I don't know what to do and i really need advice. Thanks!