hey grizz, good to see you, sorry for the current chapter you are living out of.
this is not medical advice, but a lot of people have irregular heartbeats or murmurs and they are not always detected with the stethoscope. i would hold off on any panic or Def Com 4 alarm until the cardiologist visit is wrapped up - they are the experts in all things HEART and will run a series of test to confirm or rule out any "issues".
My own mother died of liver disease at 57. She also had a bad heart to boot - had open heart surgery before the age of 40. I am now 56 and when i think back to the woman my mother was in her last year of life, how old and worn out she seemed (and WAS!) I don't feel that my chronological age is anywhere near where she was....so i DO get your concern....but you can't FIX her health problems any more than you can fix her HEAD problems or her DRINKING problems.
YOU take care of YOU, ok?