I never did until about a month ago.....I am almost 37 years old, in great health (or so I thought), very active (I go the gym daily and then chase a very active 6 year old around), eat right, etc. I started having some shortness of breath issues and given that there's a history of heart disease on my dad's side of the family, I made an appt. with a cardiologist. Better safe than sorry right? Well, after all the bloodwork & testing, I learn that not only in my bad cholesterol off the charts, but my iron is very low (so I'm on meds for that for the rest of my life). Then the echo test initially showed a leaking valve (talk about scared to death....my life flashed before my eyes), but thankfully, after further evaluation, it was determined that the valve is not leaking, but it is "floppy" as the dr. described and will just need to be monintored. The stress test came back fine last week, thankfully.
But, after all that, my point is, I never thought about death until now. And having a young child just scared me to death. I cried for a month straight (or so if felt) and I just kept going through all the things that I could miss with DD. I was so scared. I've gotten over that and realize that stressing over it every day isn't going to help, but I've learned to not sweat the small stuff, let things go and just LIVE.
To top it off, my beloved granny, who I have been close to all my life, lived with her for a few months last year when we moved from LA to VA and waiting for our house to be ready, died suddenly of heart attack on Monday. This lady was the picture of good health. She even did her thing at Curves 3x/week (probably more socializing than excersizing, but hey, she's out of the house right?). She had no symptoms, had been fine and as heartless and this sounds, just dropped dead on Monday afternoon. We are all numb and in shock. It's how she wanted to go, fast and painless, but I was NOT ready for her to go (yes I realize she was 86, but I'm not ready).
But OP, I think you need to find a way to let the fear of death go. I don't think it's a good thing to stress over it. Easier said than done, I get that. I wish you well!