He's anxious due to an anxiety disorder, but I've been down the road of using Impulsive Responses as Concern before. I liked it because what drives the anxiety cycle is trying to avoid that painful fight-or-flight feeling offers temporary relief, but ultimately makes pain worse in the long run, habituating the brain to fear the avoided thing even more (I considered Conscience vs Temptation). However, I didn't like OS of Being and I can't choose Avoid as the problem if I use that set of Concerns. Also, fear of failure is also a problem, but that sounds like Innermost Desires. I gave him a backstory with a failure that drove him to run away from life, so he's also afraid of repeating that, but it was giving into anxiety that caused it.
I planned on keeping it 3rd person, but personal, mostly focused MC and his thoughts. I've tried working backwards from MC, but I wonder whether his problem is the disorder or lack of self-worth with learning to face fears being OS. Is the problem fear of failure or fight-or-flight... or what he does/doesn't do about it? Is it Avoiding fears or giving into the Temptation to Avoid them for short-term relief and long-term consequences? So I went with Innermost Desires and Avoid.