I was diagnosed w/ atrial tachycardia in August after 3 trips to the ER from severe attacks. When I would have an "attack", my HR would spike in the 200s, BP would spike, extreme tightness in my chest and throat w/ a burning censation that would radiate down my left arm, lump in my throat, flushing, numbness in extremeites, weakness, faint like feeling, metallic taste, completely dry mouth and hollowness throughout my entire body. Are you having these symptoms?