Heart worries driving me absolutely mad

[Nat1996 23]

My heart rate has been high lately and I’m feeling very winded after doing hardly anything! There are times I’m doing something like washing my hair in the shower and I feel like I’m about to pass out for a second so I have to kind of hang onto the wall in my shower and take a couple deep breaths to attempt to lower my heart rate.

I was so stressed about it over the weekend I went to the ER to have it looked at. All they did was listen to my heart and lungs and did an ECG and then said “it seems like you’ve been to the ER quite a bit for anxiety related symptoms so do you think maybe it could be that?” I felt so embarrassed and invalidated it was terrible. But I’m not feeling reassured at ALL that it’s anxiety because how would they see if there was anything wrong with just one test!? 
 

Im in my early 20’s I shouldn’t be getting so winded and needed to catch my breath during normal activities. I’m convinced there’s something else going on, there has to be. The not knowing is driving me insane 😭😭 nobody takes me seriously as soon as they see I suffer with anxiety!! HELP 

[Iugrad91 500]

I don’t mean to be harsh, but if you go to the ER they won’t send you home if they find something that would endanger your life. How do you know one test isn’t enough to clear you for serious heart issues. If there was anything wrong it would show on the ECG. Have they done any other tests during your previous visits? Taken blood?