Impending sense of doom is actually a recognized symptom of several serious conditions including (but certainly not exclusively) pulmonary embolisms and blood transfusion reactions.

I work in psychiatry which is fucking hard mode. People tell me they're dying all the fucking time and 90% of them are just having some variation of a panic attack and about 4% are either faking for drugs or some other ulterior motive, and another 4% are having some benign symptom like heartburn or a stuffy nose that they're too anxious, manic, or psychotic to process or cope with correctly. The other 2% are actually dying, but it's usually because some minor issue has been getting overlooked for waaay too long because somebody saw a psych diagnosis in the chart and just assumed it was one of the other things.

I once took report on a guy under an involuntary hold coming down from the mountains who the podunk ED nurse told me had an oxygen percentage of 92% (lowish) but that an x-ray showed some kind of chronic illness (plausible). Two hours later the cops bring him in and his O2 is in the 70s. Our intensivist wanted to know how long he'd been like this and looked at me when I was insane when I told her he'd been in the back of a cop car for two hours and for all I knew there could have been a rabid badger back there and the cops wouldn't have known, wouldn't have cared, and certainly wouldn't have been willing to tell me. The worst part was his mental status stabilized and he was able to talk to us when we gave him oxygen by nasal cannula which is the device with the least flow, so yeah the mountain ED saw schizophrenia in the chart and just didn't even try.

The moral of the story is: psych patients probably aren't actually dying, but ffs you still have to check!

In his last breath [deleted] cried: [removed by reddit]