"It started 10 years ago. I was sitting in a seminar in a hotel and this thing came out of the clear blue. I felt like I was dying."

"For me, a panic attack is almost a violent experience. I feel like I'm going insane. It makes me feel like I'm losing control in a very extreme way. My heart pounds really hard, things seem unreal, and there's this very strong feeling of impending doom.

"In between attacks there is this dread and anxiety that it's going to happen again. It can be very debilitating, trying to escape those feelings of panic."

People with panic disorder have feelings of terror that strike suddenly and repeatedly with no warning. They can't predict when an attack will occur, and many develop intense anxiety between episodes, worrying when and where the next one will strike. In between times there is a persistent, lingering worry that another attack could come any minute.

When a panic attack strikes, most likely your heart pounds and you may feel sweaty, weak, faint, or dizzy. Your hands may tingle or feel numb, and you might feel flushed or chilled. You may have chest pain or smothering sensations, a sense of unreality, or fear of impending doom or loss of control. You may genuinely believe you're having a heart attack or stroke, losing your mind, or on the verge of death. Attacks can occur any time, even during nondream sleep. While most attacks average a couple of minutes, occasionally they can go on for up to 10 minutes. In rare cases, they may last an hour or more.