Hi A1989A,
How is your chest feeling recently? I hope you're feeling a little better - did you try the eucalyptus steam?
I'm sorry to hear you have been so upset recently by worries of death. I admit, I sometimes get pangs in my stomach when I think of my loved ones getting unwell or of my own passing too, so you are not alone in this.
I think why it bothers many of us is that ultimately it's something that's out of our control. We cannot really prevent it and other than taking reasonable steps for good health and safety, we must accept it as it comes.
My advice to you would be to try to build some strategies to self soothe and calm yourself in these moments. Do you practice any form or meditation or mindfulness? Grounding ourselves through deep breathing and focusing on the here and now is a helpful way to get out of our heads and back into the present moment. There are lots of good guided tracks for this on YouTube. I suggest looking up Body Scans as a starting place.
Let us know how you're going when you can.