Possible Clues:

• Anxiety you may feel on a Friday night, slangily
• Acronymic feeling
• Anxiety about being excluded from the fun, for short
• Anxiety spelled out by the starred answers' starts
• Exclusionary anxiety acronym, and a hint to the four theme answers
• Anxiety over not taking part, for short
• "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