I'm glad you're here. Tell us in the comments, What part of the day do you dread most? What do/did you teach and what grade? How well do you know your nervous system?
I dread running into coworkers in the hallway before school (read: before coffee). I teach 3rd grade now, but I have taught 4th-6th over my 26 year career. So, yeah, 26 years = my nervous system is fried and it let me know it last year.