I just thought of another related concern:

There are times when I'm in a conversation with someone and I realize midstream that I don't know what they have been telling me. Sometimes, I can notice myself responding in a way that seems appropriate to the situation (nodding yes or no, making comments such as "Oh, really?" or "That's nice." It's like my body is responding with the correct reaction, but my brain is not processing what is being said to me. Therefore, I can sometimes walk away form a conversation and not know anything more than a general gist of what it was about. However, at other times, I can concentrate very well for long periods of time whether I am in conversation or at my job, which involves editing, which is very detail oriented.

Does this sound like a PTSD or dissociation thing? It's just so confusing!