My boyfriend and I are very interested in the ANR method. However, doctor friend, a world renowned cancer researcher,  has advised me that the ANR method may not be safe for older patients.  It can cause heart attacks, strokes etc. 
As a 69 year old woman having been on Fentynal, much stronger than Heroin, morphine etc., for a decade, I am concerned that I would be at particularly high risk. 
I would like to know the risks and what they are..is that possible?
Thank you. 