This is a great post. Congrats on all the hard work that you put into your recovery. I don't think we mention enough how much strength and dedication it takes to get to the place where you are now. So many people just want to "get back to normal", and they tend to discard all the months or years of an incredible struggle and effort they put into getting better. It is something to be proud of, as it is often the most perilous thing we will face in our lives.
Another thing we do not mention enough in relation to DPDR is trauma, especially prolonged childhood trauma, that can have many forms. A lot of people don't even realize they were traumatized in their childhood, because it was so normalized to them. And of course, there is repression. Or amnesia, as in my case. I went through some of the photos from my childhood, and on every one of them, you can see a child with a completely absent look. I was traumatized beyond belief, and I somehow managed not to look that way for quite a long time, until DPDR didn't actually force me to deal with it.
It was an incredible luck to get to work with your therapist, but if it weren't for your resoluteness to help yourself, it wouldn't have happened.
Not everyone will necessarily identify with your story, but the point I took is that recovery takes - besides dedication - a structure and professional help, preferably in the field of trauma-informed therapy.
I can confirm having those symptoms, as for me DP was exactly what the name says: DE-personalization. The terrible sense of having no person inside of the body. Or having a changed personality.
It is possible, however, to have other conditions besides DP. And actually I will use the opportunity to say that we can all be talking about different things here. I was actually dx with DPDR, as in Depersonalization and derealization disorder. Some people may be feeling depersonalized for other reasons. My condition was among dissociative conditions for most part caused by developmental trauma, so it was possible to treat it with trauma-oriented therapy.
Share your concerns with your therapist, if you continue to wonder. They should be able to discern if there is anything else going on.
It sounds like a lot of evaluation...I always think of therapy as a sort of team work. You are adding one member to your team who will help you go through stuff that you cannot do on your own. In that sense, I always felt free to influence the course of my therapy, if I feel uncomfortable about something, or I have something important to report. I cannot know how it will go with your therapist, especially since it is a bit different over the phone, but I think I would make sure that, in spite of all the preparation/evaluation that is needed, I get some feed-back to what I am going through atm, especially if you are in such an acute emotional pain. I don't know how that sounds to you, but in therapy I think that therapist and client are equal, as our self-reporting is basically setting the base for any kind of further therapy, so our input is just as important as theirs.
I understand that you are going through a storm rn. I felt that for me it was important to feel understood, and also to have some sense of belonging, wherever it was possible - including an online community of people who experience something similar. A big part of trauma has to do with attachment, so it makes sense that we need other people and some compassion to get through the hard times. Know that you are not alone, and that no matter how hard it gets, the recovery is possible.