If there is one emotion that fraud victims speak of more than any other, then it has to be FRUSTRATION!.
This is not something that any of us want to deal with.
Frustration comes from recollecting points at which it could have been avoided, incorrect decisions, the feeling of why me and quite often, the lack of help or interest from the relevant authorities.
So get frustrated, but find a way of letting it out of your system. Afterall 99% of your customers love your business and are trustworthy and honest. Don't let the fraudsters destroy your view of the world.
Life is full of opportunity. Think about security and fraud prevention a couple of times a day, but don't let it get in the way of running your business.