So since around 2 years ago I've been told by my GP that I have tachycardia. My resting HR is always above 100, but no cardiologists have found any fault. Fast forward to couple of months ago, I landed a job that pays well, but comes with very high demands and expectations. Coworkers challenge me all the time and I have to keep at the top of my game to keep being relevant.

Ever since, I feel tightness around my chest more, sweats way more, and at worst time I feel guilty and dreads disappointing my boss. This leads to me being counterproductive and lowers my output and quality whenever I feel anxious. I end up not wanting to do anything, not even my hobbies, and reduced appetite. 

I should talk to my psychiatrist again, but this is the first time I've experienced anxiety enough to cripple my routines. I have a huge deadline next week and I'm not sure how to proceed.. anyone who's been in a similar situation, what kind of actions can I do in the short term?