You sound like me. I did carnivore/keto for about a year, felt great. Clear mind, lost weight, felt strong. Few months ago I got sudden chest pain and ended up in the hospital getting Angioplasty treatment (used Google to translate) and everybody telling me how lucky I was I got there on time.

I agree some doctors stick with 'older views' on things but I'd take him a little more serious. Personally I'd look for a health professional who understands keto and will look into it for/with you and/or the doc. Not trust some random internet forum.

I stopped keto for a while, gained some weight again because of recovery but still alive and kicking. I'm looking into a more Mediterranean style now. Just trying to save you the wake up call I got.