If your child has changed in a way that concerns you, listen to your intuition. You know your child! Don't be embarrassed to ask for help or for an objective opinion. It often only takes a session or two to figure out a new technique to help your child, or you, through a "phase", or to head off a deeper problem.
Here is an article that can help parents know when to seek help: "Facts for Families" from the AACAP