Hi Salukigirl!
congrats on your breakthrough. Its great you were able to ask your father and get it checked out. Ive had anxiety for something over 27 years or so and my memory is appalling - but nothing traumatic has happened to me, I just think its an effect of the anxiety itself...Ive spent too much of my life in an anxiety induced detached-from-life fog! So please dont worry too much about what else might be lurking beneath...use this insight to help you continue moving forward.
I know what you mean when you say you were not sure if it was something you dreamt, or saw in a movie. I find my family will talk to me about something we all did together some time ago, and I can imagine it, but I dont feel like I am really remembering it. Oh well.
Oh..and tell you Dad what a hero he is! A frightening experience, but with a happy end on the day!

Matt C