It's unfortunate that you have to worry about your breath when you are at work or interacting with clients. halitosis is commonly caused by bacteria that are present in the plaque and deposits on the teeth. sometimes, it can be due to other medical conditions such as gastric problems or lung diseases.
please get yourself evaluated by a dentist to eliminate oral causes . Usually one or more sessions of professional cleaning by the dentist will eliminate most of the symptoms.
please do keep in mind that this is a common problem that is dealt by the dentists so don't worry about any embarrassment or guilt.
hope my answer helps.