Bad Morning sicknes please help!?

Hey i just wanna know im 8werks preggo and have very very really very bad Morning sicknes, for when i get up untill going to bed Even when waking up in Middle of the night. I don't eat that good coz i don't keep in my Food. What can i do? And Why is it so bad please help! I have 2 boys and Both pregnancys was a bresse but with this 1 im suffering!