This has been a constant for me for years. I'm not sure if it's a form of psychosis or just part of my BPD or other mental health issues but sometimes I just get irrationally worried that the person I'm thinking about is going to die. I go into so much detail in my mind.. what I would say at their funeral, what music I would ask to be played.. I also obsess over my own funeral when I get suicidal ideation but it's not the same as with other people. Sometimes it makes me freak out to the point of either hurting myself or becoming suicidal so I don't have to deal with the perceived loss. Is this BPD? Or something I should just talk to my shrink about. (I never remember to bring it up).