The person is the difference. Other than that idk
Providing correct diagnoses. but since most of the contact is in physical appearance, being observant would be best. so in reality Good note taking skills, you keep track of whats going on and you are organized.
These things can lead to people feeling those certain feelings
Depression
Anxiety
Stress
Not enough nutrients
Sleep deprived
That can be taken many different ways maybe: they push themselves to hard and don’t know when to take a break or they cant settle down, sleep or, don’t know when to stop.