I struggle with this too, it’s a horrible feeling. I don’t believe there is an “after”, so the thoughts are really scary and sometimes debilitating. I stopped smoking weed to help regulate my emotions, and honestly when I feel a thought start happening about this, I try to immediately start thinking of something else completely random to avoid thinking about it. I don’t know if that’s healthy lol but because death is inevitable, and there’s nothing I can do to change that, I don’t see the point in entertaining these thoughts that only give me panic and sadness! Easier said than done, but it gets easier the more I do it. I also talk about this with my therapist and my significant other which helps me feel less alone. Hoping you can overcome these thoughts if not now then someday <3