Emphysema, severe asthma, and other forms of long-standing respiratory distress.
Macrocytosis (deficiency of <span style = 'background-color: #dae8f4'>b6</span>
, B12, folic acid, or hypothyroid)
Adrenal cortex overactivit
I've had severe vitamin
B12 deficiency and from your symptoms you list, I had severe fatigue, difficulty concentrating aka brain fog and chest pain.