Anxiety or something else?

Anonymous
Two days ago I had either the biggest anxiety attack in my life, or something is fucked up severely with my body.

I was woken up out of my sleep with severe tight pain in the middle of my sternum, which slowly died down and maintained a painful but bearable pressure. I quickly felt my body get a little weak and felt pain in my back, but then that all subsided as well. My stomach started to hurt a bit along with the pain in my chest, and it became a little harder to breathe. I went to the hospital on account of my girl who thought I was having a heart attack, and they did bloodwork, xrays, and an ekt, all coming back with negative results which they released me with confidence that it wasn't a heart related problem. It's been 2 days now, and I still feel my chest hurting slightly every once in awhile. I felt a 'swooshing' feeling in my chest last night, and today my heart has been pounding like crazy.

Did I just suffer a massive anxiety attack, and am still recovering? Or should I go back for a second opinion? I'm only 22 for god's sake.. there's no way I'm having a heart attack.
Updates
+1 y
It turned out to be a massive anxiety attack and I have to go on meds and seek therapy for it. Guess thats better than organ damage.
Anxiety or something else?
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