You Can Scream !
I find a quiet place, like my room, and I SCREAM into a pillow. (A pillow does muffle the sound.) It is NOT advisable to scream out a window, because your neighbors might call the "Po Po". Disturbing the peace is a misdemeanor & they could arrest you. (Not worth the agony, especially if your boss is a real Adam Henry and he's the cause of the stress to begin with!) Cheers!