I used to have catastrophic panic and/or anxiety attacks in high school: hyperventilation, paralysis, shrinking vision, paraesthesia/numbness, loss of motor control in my face...yeah. Thankfully they had pretty specific triggers and therefore didn't occur too often (perhaps once every few months), but there was more than one time the school ended up calling paramedics. Was on Paxil for a year (all of 2002) as a result of what was probably the worst one. Sent to therapists a few different times over the four years I was there, too.
After graduating, I've only had one, and that was before getting my wisdom teeth out. Based on that, the oral surgeon's office said it'd be okay for me to take a diazepam before the surgery - I couldn't walk after taking just half of one.
Signing up for Facebook almost threw me into one, but it didn't *quite* get to that level.