Emotional wreck.. 😭

I'm 39+1 with my 3rd and for the last few days I have been an emotional basket case.  My two older kids are wonderful but everything they do makes me CRAZY.  I'm exhausted, not sleeping well, anxious for baby to be ready for labor and have been having prelabor contractions for over a week.  
Is anyone else just honestly, truly DONE?  I don't remember feeling this emotional or upset near the end of my pregnancy with the other two.