For nearly four years now I've been having these spell type things. It started when I was twelve, the year I both started my period and had my appendix taken out. I'm almost sixteen now and it still hasn't gone away. It happens at varying times. Sometimes I'll go a few weeks without experiencing it, and sometimes I get it twice in one day. I'll stand up and it'll just hit me. I get this severe, sharp headache right over my eyebrows, and my vision gets really blurry, and I get dizzy and feel like I'm going to pass out. My whole body gets cold and it's hard for me to breathe, and my heart starts pounding really hard. It's been so bad that I've been one one side of my room one second, and the next I'm on the floor on the opposite side of the room. This really frightens me, because there is absolutely no explanation for it, and I'm all the time living in fear of when it'll happen next. I get my license in June, and I'm worried about what'll happen if I get it while I'm driving. And incase it helps, I'm 104 pounds, 5'3'', have low blood pressure, and I was diagnosed with depression when I was thirteen(I've heard that these are symptoms of panic attacks, which can link to depression)