How much morning sickness is 'normal'?

I was really sick when pregnant with my daughter (now 6 yrs old), but this time around it's even worse. I know I sound like a cranky complaining person', but it's like I can't do anything without starting to throw up. The only thing that makes it more or less bearable is sitting in a chair.. Lying down only makes it worse. The last two days it has gotten even worse. I tried working yesterday, but it was an experience I'd rather forget. Would this be enough reason to call my doctor? I know I sound like a cranky complaining person