Boy can I relate. When I first started to recall things, I really didn't fully trust my own memmories either. Thank God my therapist was supportive through my self-doubt. Or else I'd be dead right now. I felt so unsure. I didn't want to believe myself.
I think you have to go with your instincts. And if your therapist seems unreasonable, change. This is terriblly hard as it is to deal with, You NEED a support.
Everyone is a genius! If you were to judge a fish, by its ability to climb a tree,
it would think it was stupid all of it's life.