All day sickness ?

Hi, i m 5 weeks 5 days preg n m having this morning sickness all day.. I can eat wel. I feel to vomit all the time. I dont want to eat or drink anything ( not even water). Even when i think of some food i feel to vomit.
Can anyone help me. Any suggestions. 
This is my second pregnancy. I didnt have any these symptoms in my first.