Hi, and welcome.
I know how all of this can be sooo confusing. There are some good resources online to look for info via searching PC.
Here are some good resources to being reading about depersonalization (a specific type of dissociation) to see if you feel it "fits":
http://psychcentral.com/search/index...hits=10&Rank=1
Depersonalization can be a diagnosis of its own or can be a secondary symptom to another anxiety or dissociative disorder.
I would talk further with your therapist about your dissociation to see if she can help you with your questions as well.
Also, we're here for you.
kd