Your drug is also used for anxiety, usually social anxiety, so it might be helping. But when you're obsessive about something, the only way to overcome it is to stop doing it. If you think taking the drug isn't helping but is just obsessive, a good therapist, probably one who specializes in CBT, might help guide you through this. But if you feel you're going to need medication, well, you're on one used for anxiety that's easier to stop taking than most. You're the only one who can truly decide, but the one thing about therapy is, when it works, and who knows how often that is, you're done, you're cured. Medication just works on symptoms, not causes. Good luck.
You posted about your cardiophobia a few weeks Have you tried therapy to deal with it?