Chest feels like it’s holding a fuse.
I don't really know how to answer that. Everyone says I'm "handling it," but I feel like I'm sleepwalking through the week. I get up, do the meetings, send the emails, and meanwhile my chest feels like it's holding a fuse that's almost out. I can't even explain what exactly is wrong.

It sounds like you're keeping everything moving on the outside while carrying a lot of pressure inside. When that fuse in your chest feeling shows up, what do you notice happening around you or inside your body?
Try breaking tasks into smaller action items and set calendar reminders so nothing slips. Once you finish a task, check it off and reward yourself with a short break.
Take a slow breath in for four, out for six. Notice one small spot in your chest that feels even slightly softer.