Hi, you are welcome to post in multiple forums. Here we deal with mitral valve prolapse dysautonomia (also known as mitral valve prolapse syndrome), which is distinct from mitral valve prolapse itself. Judging by your symptoms of fatigue, anxiety, shortness of breath, palpitations, and chest pain, I would say that it is reasonable for you to want to investigate whether you might have MVPD/S. I believe this article (it is in a pdf format; contact me if you need help accessing pdfs) should answer nearly all of the questions you asked; it is from a very reputable source. The Cleveland Clinic, in addition to being one of the nation's top hospitals, also houses one of the few dysautonomia clinics in the US.
One note: this was published in 2002 and so far as I know the American Heart Association no longer recommends prophylactic antibiotics for dentistry for the majority of MVP cases, only for exceptional cases (presumably particularly high-risk cases). See here:
http://www.americanheart.org/presenter.jhtml?identifier=4717
http://www.mayoclinic.com/health/mitral-valve-prolapse/DS00504/DSECTION=complications
Here's an overview of MVP (not dysautonomia):
http://www.medhelp.org/medical-information/show/3456/Mitral-valve-prolapse
If you would like to seek out a dysautonomia specialist:
http://www.medhelp.org/health_pages/Neurological-Disorders/Dysautonomia-Specialists/show/717?cid=196
You can probably get your best dysautonomia-related answers here and general mitral valve prolapse answers in the heart disease community and heart disease expert forum, but feel free to ask away with whatever questions you have and we'll do our best to answer/find you the answer/redirect you to someone who can get you the answer.