Remember to breathe..this will cut down on the heart palps and anxiety etc.
Upskill so you can take the bosses job and can delegate a job like yours to someone else lol...
I don't have any answers as to why we suffer with anxiety...but the best part about it is it doesn't last forever - thank goodness!
Are you on any meds to help you through this rough patch? Have you ever considered counselling/therapy as an option - if for no other reason to brush up on skills to cope better with stress..?
Maybe you could organise a staff training based around this theme that would benefit everyone in your workplace.