It's either directly or indirectly related. Directly in sense of still induced physiology changes. Or indirectly due to the excess worry LTC was causing me. Also it's purely body anxiety, not mental. I'm calm and in total control, waiting to be over, but my body is like "OMG we are bombed, oh no there's dinosaurs too, watch out from the lavaaaghggg!" You get the picture...
I also get anxiety like this.
I’ve had anxiety before, but it was when I was worried over something. Being sick, taking an exam, work... maybe the cause was irrational, but there was a cause, and I could always think about it and calm myself.
But now it is like just the feeling of anxiety, but without being worried about something. As you said, my mind is calmed, but I still get this awful anxious feeling.