It was researching the internet and discovering MVP can be brought on by thyroid disease that prompted me to ask for a thyroid test (undiagnosed for a two years). I already had one mitral valve prolapse (maybe genetic or brought on by childhood measles) but was then told I had two leaky valves.
I was then sent to a heart clinic where they prescribed strong betablockers, etc. which made me feel ill and dizzy and I told the specialist I thought they were too strong (I am 5'2 and just over 8 stone). GP and specialist ignored me - I stopped attending and, instead, took garlic, olive leaf and hawthorn capsules, I eventually discovered that many of the medications I was on deplete vitamin B12 and this may have been contributing to dizziness, foggy brain, etc.
All heart and cholestrol problems resolved after optimal thyroid treatment and I don't need any medication apart from the garlic capsules, which I still take.
My son, a diver, came across medical research that people who have migraine with visual auras should be aware that it could be dangerous to dive - it was due to a tiny hole in the heart (MVP) - otherwise not particularly worrying. I'd had migraine with aura on and off for years.