Does dissociation always come back? Will it always be there?

I used to dissociate with my last therapist but then as I felt more safe with her generally I didn't at all anymore. But with this new therapist it has come back again strongly.

It is frustrating because I know I can have emotions without dissociating and I feel I'm slowing everything down by doing this (not that it is controllable at this point but still). I get irritated by this, that it has returned.

Hopefully the 2nd time around it'll take less time to dissipate but what if it takes just as long. How can I speed it up? I don't like this being out of my control - not only is it embarrassing but it is a frustrating waste of money spending part of the session out of it or having to do small talk just to get me back to myself again.

Anyone else experience this? I don't know why I do it, it makes no sense.