This happened to my mum with me, she said eating food made her sick, she could barely eat. However with my younger sister she wasn't so sick. Equally one friend also had a much easier, less nauseous, second pregnancy.
It is normal to be sick every day, as long as its not to the point you're dehydrated - if you are you need to call the doctors. It doesn't mean you'll be sick each time so try not to worry about future kids.