My morning sickness has me worried, help?

Well, more like all day and night sickness. When it first started, I thought "This is common. This is normal." But after two weeks and almost ten pounds lost, I had to be prescribed Zofran. Well, I ran out a couple days ago and hit my 13 week mark. I figured it should be letting up right? Wrong. So wrong. I was vomiting up everything I ate, and even more concerning, I couldn't even keep water down. So another refill of zofran it was. I'm worried about having to be on zofran this long. And the severity of my morning sickness does not seem normal at all. I hope it goes away in the second trimester, but I'm worried it might not. Throwing up even water seems too extreme. What's wrong with me? Any thoughts on this?