my boyfriend has been feeling very nauseous every time he wakes up for work at 6:15am and usually throws up. every morning! that can't be good for him.. If he wakes up later, like at 10, it doesn't happen. He often has night sweats, also. i don't know what to tell him to do!

does this sound like a deficiency? he has been vegetarian all of his life and he was raised vegan until he was 10.
or it could just be his diet right now. he doesn't eat very much. he's 6'2'' and weighs about 140lbs. he doesn't eat anything for breakfast (ever), and i hope that he eats lunch (he's a landscaper out in the hot sun all day)

any ideas???