I get a type of asthma, mostly ok, but when I get stressed, I get those symptoms you speak of, namely feel ok, but get extremely tired, yawning, confused, frustrated.
Even others notice the black rings under the eyes, as well as the 'strange' look in my face (which goes a darkish shade, especially the nose area).
I feel a little confused then, but basically fine?
Always been told "It's the way you look that makes us frightened"! How must I feel?
Taking asthma sprays don't help, because I'm breathing ok, but just totally fade out, until I must rest, or I get so stressed, I worry myself! - and others...
Drinking water at this stage seems to help, along with a sleep.