This a new one for me.. I'm 23 and do suffer from health anxiety, and it was much better lately until now, that I really fear, I have lung fibrosis coming up.
I've been obsessing a bit about my breath. I breath faster than normal, think it might be chronic hyperventilation. My nail beds are alway blue-purple, not a nice pink color. And I've been coughing, especially after a meal, for about 6 months.
I don't feel like I have shortness of breath, but I do exhale very fast.
Family and friends pointed these things out for me, and it really trigged my anxiety.
Also because, I justed to sleep in a room with a cat and often smell from the litter box. About 5-6 years up until 7 years ago.
I struggle a bit myoclonic jerks as well, neuro says they're benign.