This whole situation is strange. They should really have the emergency hotline scheduled around client sessions, or have the hotline run by masters/ PHD interns or volunteers with someone supervising, rather than stretching the therapists so thin.
I would be very upset too, and feel like the session was a waste. Once when I was a teenager my therapist kept having to take calls from her husband because their basement was flooded. It was such a distracted session. One of my more recent therapists had to take a call once because her daughter was sick at college, but that went smoother.
I would certainly talk about this at the next session. And yeah, I'm curious too how your t handled you saying you were anxious in the beginning.