I think you should forget about the psych. Go back to your GP and tell them what happened last week and how you have been feeling and say you want to be referred for counselling.
I really think all this is a crisis which has come about because your subconscious is ready to face up to your past, ready to process it and finally put it away. As Rhubs said, your mind will go ahead with or without you, and it will be much easier for you to cope if you are guided by someone who understands what you are going through.
I did it. It was the best thing I ever did. I am about to start CBT now to stop the endless pattern of getting too anxious about something and then that triggering depression. Am being treated by very sympathetic GP and am already much, much better.
Nab, you have had such a hard time, particularly as a child, and it is a testament to what a great person and survivor you are that you have still managed to build a strong marriage and have three lovely, balanced, happy children. Build on that - you should be so proud of yourself.
You have broken the pattern that your mother set up for you. Now you need to heal yourself.