This week Insight replays one of our most popular programs from last year. A panic attack can involve a rapid heart rate, nausea, tingling, sweats and a sense that "you're going crazy" or "losing control". It can happen at any time and affect almost anyone. Anxiety attacks and disorders are the most common reason people in Australia get counselling. The condition affects over 10 percent of the population at any given time, and it's estimated that one in four people will experience it over a lifetime. We hear from one man who was unable to leave his house for years because his social anxiety became so debilitating, and from a woman whose panic attacks control her daily movements. We also talk to psychiatrists, psychologists and researchers about treatments for anxiety sufferers - and hear how online therapy is revolutionising treatment.