I suffer from anxiety and depression too. Just about a week ago or so I got a panic attack while replicating a painting for a class and it was completely unrelated but I started crying so hard and shaking I almost ruined the work. To be honest, I can't even quite remember what the panic attack was about, I know it had to do with myself but actually pin pointing it is weird but everything felt like a daze for about 2 days or so, I'm surprised I managed to go to class at all.
Depression runs in my family, sadly, and it's been a tough upbringing in my case, so I have to say when I was finally diagnosed with major depression around 2012 or so, it came to no surprise but at the same time like 'oh...' hit me. I can see the episodes coming, and I mostly prepare for it. I've been able to deal with it without medication but as time goes on I realize I can't handle it on my own. (I left my psychologist when I wasn't happy with the treatment and never went back. (She was convinced asexuality wasn't real and raised an eyebrow when I identified with it at the time))
Anxiety is what I'm getting used to now since it's been growing over time to the point I suck socially. For me to even set foot in this forum took a lot out of me like 'jesus I'm such a noob, I screwed up' and even when I try to show up in artist meet-ups. But I'm slowly working on a way around it. I mean, here i am, and already signed up for a festival next year. -waves tiny flag- Also you'd be surprised how people don't notice...like, at all.
Just know, you are not your anxiety nor your depression, those things are part of you but they don't define you. And it's hard, really, to fully wrap your mind around it, but it's possible to work with it and grow from it.
But it's not an easy battle, it never is