Okay - first things first - take a breath and just relax for a moment. I can tell by your email that you are very upset. Rightfully so, I might add. But giving yourself a chance to be calmed for a moment may help.
As for setting up an appointment with a counselor - it's not a bad idea, but have you considered setting one up for yourself first? I know that right now the only thing you can probably think about is confronting him and leaving in a rage. I can understand that completely. However, holding it together for a time to gather your thoughts and possibly to talk it over with a counselor might help you to cope with this the best way you can for you and your children. Is that a possibility for you?