If you don't like your doctor, get a different doctor.
Your story is hard to follow.
Which nurses were saying you were having a heart attack and when and why? the hospital nurses?
Anxiety can make you tense up and sweat in fear which makes muscles in the chest hurt which can be frightening but is harmless. A heart attack feels like a heavy weight is pressed against your chest, so you are not having heart attacks. See if you can relax for a few minutes and if so the pain will go away if there isn't anything wrong.