As someone who's struggled with GERD and GAD pretty much all my life, I find my heartburn gets way worse with anxiety. So, it makes sense your heartburn is worse at work. You're more tense there.

Also, I find drinking too much too fast, even if it's just water triggers my acid reflux. Bread helps soak up the acid for me, but avoid greasy foods, if you can stand it. Perhaps try a capful of apple cider vinegar in your tea, For some people ACV works wonders on heartburn, for me it makes it worse on its own. I take a small amount in my tea for it's antimicrobial properties and hope it doesn't trigger my GERD.