KATO-- Since you have had such a life threatening heart problem at a fairly young age, and because your relatives have similar issues, I would get a DNA test for MTHFR. This is mentioned in this good link as connected to high B6 test results as well:
The Cause of Vitamin B6 Toxicity is Not What You Think
The main website for it is here:
MTHFR Mutation | MTHFR Gene Mutation | What is MTHFR? - MTHFR.net
This test does not need a doctor to order it, from 23andme.
If a doctor does order it your insurance may pay for it, because of your cardiac history.
It seems that frequently now, we see a poster here who has done this test and tested positive for one or more mutations affecting methylation. We have one poster here recently (janieg) who found a mutation in biotin metabolism. She is our first one!
I'd really recommend you do this test to see if you and/or your family members could benefit from it.
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All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
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Weezie looking at petunias 8.25.2017
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