I'm not sure if it's due to all the times I've almost choked to death paired with a bad experience with LSD, but I randomly just keep panicking (usually around bed time) that I'm going to just stop breathing or I'm not getting enough air, despite me never actually having symptoms of not being able to breathe or anything, it's like a fog comes over me and I start just breathing through my nose and focusing on it to ensure I don't stop breathing, and I get terrified of opening my mouth to take a breath in case I for some reason can't and I don't want to stop breathing through my nose and possibly mess up the bit of oxygen I am getting, I also keep forcing myself to yawn until I can get a deep breath to assure myself I'm fine