Sounds like textbook anxiety disorder, especially the physically feeling like you’re about to die despite being in good shape. I have it too. Usually at least once a day I have a panic attack thinking that I’m about to have a heart attack or stroke and die, despite the fact that I’m 23 years old and have never been diagnosed with a heart condition.
Maybe. I don’t think it’s straight up anxiety though, because I’m not really nervous about it, or even really panicking so much as just feeling like I’m about to die. In fact, my immediate response is confusion rather than nerves.