Need some help here, im quite worried

Hi all,

I am currently 18 years old and have been doing sports regularly. Recently i went for a medical checkup and my ECG showed that i may have a probable LVH and was scheduled for a 2D-echo during june. Prior to the checkup i had minor chest pains for 3-4 years already but it was not accompanied by any other symptoms so i was not worried. However, this year, my heart started beating hard - like not rapidly but HARD and my physical abilities were worsening. I could feel it getting harder and harder each day until two days ago when the palpitations was accompanied by dizziness, nausea and weakness in my legs. Got admitted straight into the ER, they did the exercise stress echo and everything was normal, my blood test was normal too. So in the end, they diagnosed me with inappropriate sinus tachycardia and gave me a week's worth of beta blockers to be consumed only when i was in pain. The weird thing is, even when i got discharged from the hospital, the pain remained there and the beta-blockers doesnt seem to help at all even after an hour from taking it.

Some notes on my pain
-My heart beats super hard and distracts me from my activities. there are times that when i feel the "lub-dub" sound is consistent with pain
-The pain can be sharp or squeezing and it can be continuous or on-off with a variety of different intervals
-When my heart is pumping, i can feel the blood rush into my blood vessels almost like squirting a bottle of empty soap
-The pain is mostly centered over the heart area but spreads to the rest of the chest and up to my neck, never in my arms.
-Whenever i cough, i feel like my throat just got ripped apart.
-(not sure if this is related) There were times when i lost my vision (i didnt faint or anything, just everything went black but i could remain standing) before it comes back 1-2seconds later

Should i still be worried? Because right now, the pain is still here

Hi,

Yes, i was admitted into a hospital and a cardiologist attended to me. They did an exercise stress echocardiogram (which they told me was a better test than the 2D echo and i need not go back in June to do the same test) and the results seemed to be normal. There was no LVH present even though 3 of my previous ECG showed an extremely high voltage in lead II R wave > 2.6mv.
The pain is currently expanding to other areas of my chest at the moment