Something that is rarely acknowledged is that trauma doesn't have to be one huge event. It can be lots of little things that cause you to disconnect in the same way. I'm curious what the general tone of your childhood was like. You mentioned a bad relationship with your father. Would you classify it as emotionally or verbally abusive? Were you well liked in school? Lots of friends? Did you have any emotional problems as a kid?

I haven't heard of PTSD without the T but maybe you were effected by some things in your past that caused you to dissociate?

Another possibility is that the features of PTSD may share some diagnostic criteria with a disorder that is not as well known or as frequently diagnosed (which is why your T may not have thought of it).

I hope you find answers soon.

Be safe.

Cyran0