I get something like this when I'm pushed from too many directions and juggling things. I get very hyper and I think I'm handling it and then it falls apart and I feel exactly like I'm beginning to drown and trying to keep my head above water. I keep trying to finsh the task and keep the panic down and it grabs at my throat and chest. Does that sound similar? I usually end up raving one way or another. Talking very fast, turning in circles, pacing. I was fired from the job that was doing this to me on a regular basis and although it's been difficult and left me afraid of the next job, I think it was a good thing not to be there anymore. I think it could happen anywhere the expectations are unreasonable.