I developed this fear several years back and only just shook it recently with a trip to the ER. It only took the one for me, since I'm 21, don't smoke, no history, no problems exercising, everything came back great. I have also had very frequent checkups for other things lately and they've listened and everything still sounds OK. My blood pressure has never been bad, nothing. 

Recently, I started birth control, and I think the clotting risk (though it may only be for people with a history of clotting?) may have kicked it back up again. Also, I think reflux may have just caused a burn or something, because there's this pain at the center-left of my chest that gets worse when I breathe and just sits there. It's been there for a couple of days. 

Tonight was particularly bad because I woke up feeling weak and had waves of nausea. Cue mild shoulder, arm, and jaw pain (this has always happened; my body mimics symptoms of things when i know about them). Then, of course, I started feeling like I couldn't breathe. My panic attack calmed down pretty routinely, and I can breathe again, just not too deeply. Still, I can't shake the feeling that this chest pain/tightness that's still sitting there might be the one time I'm wrong. 

If anything, I'm just getting this out somewhere while I wait to feel OK enough to sleep. I want to put all this to rest, and maybe someone who has experienced this may have some tips for convincing themselves it's fine for long enough to avoid a trip to the ER. I keep googling, it keeps telling me to call 911, but I cannot afford that right now when this is 99.999% likely to be these other health conditions I know I have. Especially since I feel fine (for me anyway) now. 

I just hope I don't have another panic attack tonight. I was on a roll before this.