I have this fear sometimes, and last night I had it. I just kept thinking to myself, "what if I don't wake up tomorrow?".
Tonight one of my family members told me about someone they know who had a friend who passed away because they chocked on food in their throat in their sleep. The thought of not being aware that I am dying scares me, and so does dying itself, but it's not knowing when or how that scares me the most, and dying painfully. I sometimes think of how it could happen and at one time I was afraid of something called spontanious combustion (I stopped being afraid of it though when I finally convinced myself it wasn't rational because there's not enough proof that it actually does happen, and if it is real it is very rare). Now i'm just afraid of dying of natural causes, or even being so worn from the stress of anxiety and depression that I might just not wake up. It it possible to die from stress? I've also had breathing problems so another fear i've had is getting a blood clot in my lung and dying in my sleep. I went for months and months with depression not caring about this at all- I was completely apathetic and even so depressed that I wished it would happen sometimes, and some of my symptoms made me feel like I deserved to. My anxiety has been very high since the spring and ever since then i've had fears like this. What can I do about this fear?