She has always had an 'anxiety to succeed'. [=she has always been anxious to succeed]
He suffers from test 'anxiety'. [=excessive fear about taking tests]
He's been feeling a lot of 'anxiety' about/over his new job.
(..) - Mia... There are things happening that I can't explain, John. What things? Baby, are you sure they're not just manifestations of your anxiety? It's perfectly normal for new mothers to experience postpartum... You know that being a doctor doesn't make you an expert on everything, right? (..)2014 Annabelle