josh, is your boss a robot who has never barfed before? i mean, when you puke it's like bad, and sometimes you'll get dizzy from dehydration and stuff NOT GOOD.
are you out of sick time/ personal days?
p.s. you can always get a note from your doctor stating that you need a 'reasonable accomodation' for a medical condition which includes sometimes receiving half days.
Just print out this thread. Advice from the experts. You can just tell them that your physician is named Dr. Prepston, and that her assistants are named Nurse Avi and Nurse Chupe.