What you are experiencing is caused by heart damage, lung damage
and last but not least systemic arterial damage.
You were born with an extreme congenital heart and arterial defects
(possible missing arteries and definately with abnormal arteries).
This congenital arterial defects turned into "endothelial dysfunction"
when the arteries don't pulsate normal anymore, cannot provide
normal tissue and organ oxygenation and therefore your heart got
ischemic, and it almost lost an important valve (for which it tries to
compensate with that rapid heart beats).
There is nothing to be done at this stage of the disease.
The bad news is that you are dying but not fast enough. And because
the way the doctors, lawyers and media work, nobody will acknowledge
that you have a catastrophic problem, and they will claim that it's
anxiety, a bio-chemical imbalance in your brain or a mental illness so that
they will be able to commit you into a psychiatric hospital and hide your
torture that you experience.
Nobody can help you and the doctors won't do anything to ease up
your death, but to the contrary. They will prolong your life as much
as possible even if that means enourmous torture on you.. This is how
they understand their hippocratic oath and they don't want to
acknowledge that the way you die (in a dignified way) is much more
important than the lenght of your life (or death at this moment).
I would suggest you to tell your story to the local radio talk shows and
media so that these issues get open to the public. As of now, there
is much of tabu in the medical, law and media communities.
Also, ask these questions that I am posing to you in as many health
forums as possible so that all the so called "anxiety" patients will be
warned that their deaths are dreadful.