Rowean, I wanted to say that I don't think it matters if you never say what you said to them...as long as you get it out of YOU, that's all that matters.
You can even have conversations with them, as though they were right in front of you, when no one else is around...and say EXACTLY what you want to say, and let nothing hold you back. Be as radically honest as you possibly can, and see how that feels...if you want to that is?
These are some things that have helped me, along with letter writing and not sending the letters, punching pillows and taking a plastic batt to my bed and just belting the crap out of it.
Whatever gets the poison out for you and makes you feel better is therapy.