My sense is that you may be pushing yourself too hard- that was the case with me when my dissociation got to be so extreme. I don't know if you want to or feel comfortable with it- but usually being much gentler, decreasing commitments, and not focusing on the source/s of trauma for a while but mindfully distracting myself with DBT type skills/processes helps ease those states quite a bit. Being overwhelmed in other words is a very common cause of what you're going through in my experience, basically, and my experience with other people who dissociate, so... anything you can do to "change the channel" should help.