Hi S. and thanks for writing. (Would you mind telling us how to pronounce your name? I love Irish names.)
You are definitely right about irish Catholic guilt! It's a powerful force and one that you will probably need to work on, at least in writing about it.
The reason to list some (but not all) of your childhood stressors is that they tend to set the stage for later emotional reactions. If one gets bit by dogs, one learns to fear dogs. If one feels neglected or blamed or made to feel afraid or guilty as a child, those reactions can occur later in life when stressful events occur. Those are the times when MBS symptoms begin or get worse.
This can help to unmask the symptoms as messages that our brains are giving us, rather than physical injuries. That is part of the path to healing and recovery.
Does that help?