who would you need to tell your boss of what medical condition you have. just say i am not well and that is it. i dont think he /she are interested in that at all.
call by phone and tell him you are not feeling well. one covers all. just say ( ana mareedh) ana=I, Mareedh= ill
. dont say Ta'aban. this means tired which implies you had a rough noght .lol stayed late watching tv or partying makes you tired.

try it. call youe boss and tell him then show up for work, you can always explain that you wanted to try you Arabic language skills. lol
I dare you....lol....let me know how it goes