I am always feeling giddy & bloated.... morning sickness for the whole day sometimes.....no appetite. My gynea said that it's alright if you dont eat, but at least must drink something to even dehydration.
I think its better to inform your boss if your workload is too stressed. Must take care during 1st trim. If not, try to take it easy & work with a "bo chap' attitude !! Leave on the dot.