With my first child I had all day sickness, I kept throwing up and I was also dehydrated most of the time because I couldn't hold anything down. I told my doctor and she prescribed Naseau pills, it feels so much better once you eat a bit besides always vomiting it out. Even during my labor I was still throwing up. But with this baby I just recently stopped my morning sickness and I am 17 weeks pregnant. However, every pregnancy is different
Just one of the joys of pregnancy I'm afraid. Stay hydrated, eat little and often and wait it out. It'll stop around 12w (usually). You really don't want to be taking meds (especially in first trimester) unless you are unable to keep any food down at all.