Lost appetite and feeling sick

C
Does anyone else feel really really sick whenever they smell food? I suddenly can't eat anything, all my favorite foods make me feel like vomiting and the only things I've had in the last few days are warm milk, my vitamins, and tomato soup. Whenever my husband makes food I feel ill! 
This is my first pregnancy and I'm only 5 weeks along...I'm so tired and hungry! What should I do?