
High Functioning Anxiety is a blend of three anxiety related conditions. The first component of High Functioning Anxiety is people pleasing, which comes from social anxiety. Second, the physical responses such as heart racing, dizziness, tiredness, shortness of breath, etc. are signs of general anxiety disorder. Finally, the third component is rumination or obsessive thoughts, which comes from obsessive compulsive disorder.
I had no idea that what I was experiencing was High Functioning Anxiety. I knew I had anxiety, but I never knew that I fit under the category of High Functioning Anxiety. Once I had awareness that I wasn’t alone and there were others out there experiencing the same symptoms I was, I threw myself into researching. Here is information from a fantastic article called “The Characteristics of High Functioning Anxiety” by Arlin Cuncic from verywellmind.com

Sign & Symptoms of High Functioning Anxiety:
Constantly overthinking
Excessive worrying
Striving for perfection
Insomnia
Trouble relaxing
Fear of failure
Trouble expressing emotion
Fatigue
Need to please others
Problem saying no
Tendency to dwell on past mistakes
Rumination
Some people might think of High Functioning Anxiety as a gift or a curse.
Below are positive and negative characteristics of High Functioning Anxiety.
Positive characteristics of High Functioning Anxiety:
Outgoing personality (happy, tells jokes, smiles, laughs)
Punctual (arrive early for appointments)
Proactive (plan ahead for all possibilities)
Organized (make lists or keep calendars)
High-achieving
Detail-oriented
Orderly and tidy
Active
Helpful
Appears outwardly calm and collected
Passionate
Loyal in relationships
Negative characteristics of High Functioning Anxiety:
"People pleaser" (afraid of driving people away, fear of being a bad friend, spouse, and employee, fear of letting others down)
Talking a lot, nervous "chatter"
Nervous habits (playing with your hair, cracking knuckles, biting your lip)
Need to do repetitive things (counting stairs or rocking back and forth)
Overthinking
Lost time (arriving too early for appointments)
Need for reassurance (asking for directions multiple times or checking on others frequently)
Procrastination followed by long periods of crunch-time work
Avoiding eye contact
Rumination and a tendency to dwell on the negative ("What if?" thoughts and dwelling on past mistakes)
Inability to say "No," always having an overloaded schedule, being constantly busy
Insomnia (difficulty falling asleep or waking early and being unable to fall back asleep)1
Racing mind
Others think that you are "difficult to read" (stoic, unemotional, cold)
Limited social life (turning down invitations)
Inability to "enjoy the moment" (being unable to relax and be in the present or expecting the worst in any situation)
Feeling intimidated by the future
The tendency to compare yourself to others (falling short of expectations)
Mental and physical fatigue
Loyal (to a fault) in relationships
Potential for alcohol or substance abuse as an unhealthy coping method
A typical characteristic of someone with High Functioning Anxiety is a high achiever, meaning they excel at their job, school work, home life, etc. Their anxiety often goes unnoticed as their anxiety symptoms are not typical to traditional anxiety symptoms.