Throwing up continuously !! Please help

I am almost 16 weeks pregnant and it doesn't matter what I eat, I throw it up. My doctor put me on zofran but it is not helping. I noticed when I drink milk or eat any fried food it is a lot worse. So, I stopped eating and drinking those types of things. I just don't know what to do. It is so bad that I mostly drink water to feel full and take my prenatal at night.. Does anyone have any advice ? Please help me!! I have lost almost 20 pounds since finding out I was pregnant.. I was about 15 pounds over weight according to charts to start with..