i am a 32 F.I have had fleeting instances of this before but it goes away.Friday night thru Saturday it became worse.I have this chest pressure,and i have to keep taking very deep breaths.My husband took me to the ER.They ran ekg,chest xray and blood tests,nothing came up.They insinuated anxiety attack,but I dont think so.Today its back.It feels as if someone is stepping on my chest and i have to breathe deeply,like deep sighs.what could it be?