Oh boy. I hope describing a panic attack doesn't bring one on (been feeling anxious today), but here goes....
What has mostly set mine off is something to do with health concerns. If I get a pain in my chest on stomach or head, I'll start worrying about whether I have something bad wrong with me, and then it begins: Heart begins to speed up and pounding harder, I start trembling and sweating, my legs get weak. my chest gets tight and my breathing gets faster. Also -- and this part is kind of weird -- I get this feeling in the middle of chest (behind my breastbone) of something moving or crawling around. It doesn't hurt, but it's scary. Some of the time, I start crying from fear that I'm about to die. Occasionally I'll have dizziness. Other times I feel really disconnected -- like I'm watching my life from behind a glass window. I'm there, but yet I'm not. I know when it's ending when I can take a deep breath because my chest isn't tight anymore. My attacks have lasted anywhere from a couple of minutes to a couple of days (that's not just one attack, but many in a row.)
I have had so many (been having them regularly since 2004) that I have developed a rating system for them. If I'm at zero, I'm perfectly calm -- a rare event indeed. A ten is when I have to go to the ER. Everything else is in-between. I have been to the ER many times because I couldn't tell for sure if I was just having an attack, or if something was truly wrong. I hyperventilated so bad once that I started retching and trying to vomit. At the ER, they injected me with a HUGE dose of Ativan, which knocked me out. I've been through two rounds of heart tests, with results that my heart was just fine. I've also had an upper GI series, which found that I had some digestive problems, but nothing dangerous.
Partly due to experience and party to medication, I haven't had a bad one (above 7 on my scale) in over a year. Most have been in the 3-4 range. I trying to get to the point where I don't need meds anymore.
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AS: 136/200
NT: 66/200
EQ: 45/50
Go as far as you can see. When you get there, you will see farther.