I struggle with anxiety, and sometimes I get what I call anxiety attacks (which I know usually means panic attacks, but it's different, I just don't think there's a proper word for it). I become extremely short of breath and start breathing at twice the usual speed, I get increasingly nervous, and there's this awful tight fluttery feeling in my chest. The only way I know of to stop this is breathing exercises, but every time I try to slow or control my breathing, it makes me lightheaded and dizzy, and during attacks it's even worse than usual. Also, holding my breath when I'm in that state can take me from jittery to actually scared, as I'm already on edge, so stopping myself from being able to freely breathe is not a good idea. I don't know of any other techniques, so my only option is to just wait for the fear and discomfort to pass, which can take hours. If you know of anything I can do instead, please tell me!