Possible Clues:

• Anxiety you may feel on a Friday night, slangily
• Acronymic feeling
• Anxiety about being excluded from the fun, for short
• Exclusion anxiety in four initials
• Anxiety-based reason to attend a party, in modern lingo
• Exclusionary anxiety acronym, and a hint to the four theme answers
• "I wanna be there!" mentality, briefly
• Feeling that everyone's having fun in your absence, for short
• Exclusion-based angst, in brief
• The feeling that other people are having fun without you