Excessive Yawning = Panic
"Excessive Yawning Keeping You In The Panic Cycle?"
"Have you ever felt like you were excessively yawning and just couldn’t get enough air into your lungs? This is incredibly common with people I work with for panic and anxiety, but it’s also a very annoying habit. A habit that begins simply because of hyperventilation and having the feeling that we just can’t take in enough air no matter how hard we try.
Excessive yawning is actually a very common symptom of anxiety and can be present even when you think you are breathing normally. "
https://theanxietyguy.com/excessive-yawning-keeping-you-in-the-panic-cycle/