Thanks for that information.
Now I'm not sure whether I experience panic or anxiety attacks or both.
I'm generally anxious overall, but much of the time the anxieties don't bother me. I know they are there, but they don't seem overwhelming.
Then a major one will come on, usually without warning, and I feel nervous, out of control, lightheaded, unable to think correctly, and become overwhelmed with feelings of fear and dread. Most often, these last from minutes to a few hours. They also affect my physically (and or all of these might occur) heart racing, trembling, nauseated or pit in the stomach, inability to do simple things because my body is seized with nervousness - my body seems completely out of whack. I've even thrown up on occasion.
What I don't have are feelings of faint or near death's door. I also don't have anxiety attacks over irrational fears. I have anxiety over real issues, but they are magnified greatly (so the fear level is irrational, not the fear itself). I don't have these attacks when I'm doing things. They generally occurr when I've too much time to think.