That definitely sounds like anxiety to me.
You know, it's so hard for me to describe how I feel am I'm not sure if it is how you feel. I feel almost like super excited inside to where I can't catch a breath. I sigh A LOT. I do that even when I'm not anxious but when I'm dealing with anxiety, I sigh a lot.
Is that what you are experiencing? What you described sounds like anxiety, though. I think it affects people differently.