nausea/hungry

I'm about 7wks2days pregnant this is my 3rd baby lately I've been nausea. My two previous pregnancy I didn't have any nausea nothing. I didn't even know I was pregnant until 2months crazy how I didn't even know on both pregnancy. I mean I have regular periods but I guess my mind never thought about it. Well this time around is different I felt nausea for the first time in the morning a week ago and since then I feel it. in the evenings when I'm cooking for my kids and husband. I feel hungry but at the same time nauseous. My tummy wants food and I do eat little bit at a time and when finished I still feel hungry but full and if I eat more I feel like throwing it up. I drink lots of water keep my self hydrate but don't keep me full. And throughout the night I feel very hungry like if I have eaten nothing. I tell my husband he say to eat some thing just a bit but I just can't I'll throw it up. And I don't want that I hate throwing up. Is anyone going through something similar or it it just me my body reacting like this I know every pregnancy is different but it's good to know that I'm not the only one in this situation.