Hi Julie~Well, I can honestly say I think your problems are coming from the anxiety
can bring all kinds of problems to us, and what you are describing sure seems like a good case of anxiety to me.
I usually appear calm on the outside too, but inside, oh my, I am a mess. The more scared I get, the quieter I get, and I have all the symptoms you posted. It seems when things are going well, or at least better, I do not notice the PAC's or have the symptoms of panic.