No. Mitral valve prolapse is only dangerous if it progresses to more severe mitral regurgitation. At least 10% of the population has some degree of mvp, and only a small percent progress. This should be followed with periodic cardiac echo. If severe mitral regurgitation does develop, mitral valve repair can be performed with very low risk.
No. Mitral valve prolapse with palpitations can be bothersome and cause anxiety but is generally not dangerous (unless the condition progresses to significant mitral valve regurgitation, which seldom happens). Both mitral valve prolapse and palpitations can be aggravated by magnesium deficiency. Taking magnesium as taurate or glycinate often helps. See http://drcarolyndean.Com/magnesium_miracle/.