Is it possible to be lightheaded alot without over breathing? Just from nerves alone? I feel like my head is clogged or something is very wrong. I notice this comes on after im really nervous a few days before or have bad anxiety attacks. Im not sure if its my heart or not cause im also getting missed beats.. However i usually dont feel dizzy when i get the missed beats. can anyone help me please. I am really clueless how anxiety can really effect u physically.