If people are actually breaking confidentiality, then you have a right to take action against that.

If people are sharing information in ways that they are supposed to (ie. reporting things to authorities, or giving insurance companies whatever it is that they need) and you don't like that, then the onus is really on you to only share what you deem ok for people to know. It is part of their job, and nothing is making you seek help (unless it's court-ordered I suppose).

If you're worried about insurance, ask your docs what exactly they have to pass on to the insurance company. They'll be able to tell you if it's things like diagnosis or prescribed medications or what. Ask them what they share with other professionals that needs to be shared; and then you know what stuff won't stay just between the two of you and you can share information accordingly.