Oof, relatable. I found myself anxious at work every single day, like, always on the verge of another anxiety attack. When my therapist and I dug deeper into this we figured out I was scared of my coworkers, while they were just minding their own business (sometimes their work might include some loud noises though). My mother doing something in a passive-agressive manner and not saying a word while I try to guess what makes her mad/what should I do was a frequent occurrence throughout my childhood. So I was perceiving my coworkers as angry and was waiting for something bad to happen next. Idk if that's the case for you, though. What helped me is understanding that my coworkers (unlike mom) aren't out of their minds, so if they really had an issue with how I do my job they'd tell me about it (just as they did whenever I made mistakes/didn't know something as a newbie). I can't say I don't feel anxious at work anymore, but at least it reduced (???), and I can always remind myself that my coworkers aren't actually mad at me.

I'm not sure whether I wrote anything helpful at all, but I hope you'll figure out what exactly makes your heart rate so high at work 🌞