I became a vegetarian in 1997 shortly after being diagnosed with angina and advised to have bypass surgery. The diet was eventually successful so I was able to stop taking angina medication after six months, and haven't needed the surgery.
I wrote a public talk about it in 2005-6, and posted some information about it on my webpage soon after, and later produced an audio CD on the talk which is now avaialble on itunes.
It is listed as a 'song' on an album, but is actually a 40 minute talk about that experience,
The webpage can be seen for free here users.chariot.net.au/~posture/AnginaDietCure.html
The CD can be dowloaded for a small cost, and if you wish to comment or review the talk you are welcome to.