Does Citalopram work for Anxiety, low mood and Rocd

Good morning everyone

I’ve been suffering with what can only be described as terrible Rocd for the past 6 months, creating anxiety and low mood. Never suffered with any sort of mental illness before. Been with my wife for 17 years.

I’ve been prescribed Citalopram 10mg, I’ve been taking it for 3 weeks, I’ve a had a couple of days where I’ve felt slightly better, but past few days have been quite bad……how long would anyone expect this medication to start working effectively?

I love my wife and I know it’s the anxiety messing with my head. It’s just so distressing

Thank you