Warning, TMI ahead. Rather rant-ish.
I turn anxiety into all kinds of characters because, well, there are so many kinds of anxiety. However, it has been such a thing in my life, it felt so normal. I didn't realise I was doing that. I didn't know I had GAD and I didn't realise I was giving my characters various features like it.
Anxiety can make you gain 50 stone, it can make you a stick. It always tries to put you into some sort of extreme and allows for no grey area. In the attempt to control these powerful instincts, your mind (without your say) can try to apply 'reasons' with 'rules' and give you OCD. Which can make things so much worse if the rules set in (regardless of how "harmless" the request is). Which they usually do, because you don't see it coming. No one is taught or trained to recognise it. "You're just shy, get over it." "You clearly don't do X enough, with enough training it will go away."
You don't realise it, but you are both obsessed with perfection but also apathy. You only have so much energy and its hard to control where it ends up (though some OCD will certainly 'help' structure some for you). Even little mistakes that you KNOW won't derail the project but its YOUR FAULT, YOU FUCK WHY DONT YOU JUST DIE.
Agreeing with SleepingPoppy about making Anxiety a misunderstood friend. Clinical anxiety has destroyed a lot of my life. Its the main reason I struggle to get any work. People think I'm lying (regardless of referrals) that I have all this experience because once panic sets in I will forget terms about things I know inside and out. It doesn't matter that I have 10+ years of experience. Thanks to anxiety I never had late work. Thanks to anxiety teachers thought I was a drama queen despite the fact I never spoke up because the thought of disrupting anyone made me want to kill myself.
If you want to have a "good" representation of anxiety, you NEED to have a 2nd anxiety character that represents the clinical condition. Clinical anxiety is not your friend. Its that toxic, abusive significant other that has gaslighted you into thinking you'd be useless without them. Except you can't dump them, you can't run away. You are them.