i think i know what you mean. i will try to explain it but tell me if i am wrong...so i have an eating disorder and whenever i eat something and i can't get rid of it by purging, i dunno i get this really weird feeling that might be what you are talking about. you feel like...hard to explain....like, suspense? your forearms get really tense and this tight feeling deep in your chest and every time you exhale you feel like your heart is going to explode out of your chest and breathing feels different, like i guess firmer is the best way to describe it. with me if it gets too intense and i can't snap out of it my forearms jerk and i can't really control it. sometimes it happens at school (im in eighth grade) and i try to explain it to my friends but they don't get it...please reply and tell me if that was what you were talking about