I offer prayers for each of you experiencing this sorta thing. I'm sure I'm headed in this direction, as the stress in my life has increased a lot in the last few years and I'm almost 60 now. I'm surprised something hasn't happened already.
I firmly believe God Almighty has spared me of death several times over the many decades I have lived. Maybe my name is in a Book of Life and it was not my time.
Perhaps God has a plan for me, but if so, He better hurry up maybe!??
Best advice I an give is have a GOOD family doctor, one that actually cares about YOU and your health and not how fast he can fill out the computer paperwork to get his friggin check!
I know I see God everyday just because my eyes are open to see the world He created and thus I can thank Him for all.