16w and still nauseous.

Courtney
I'm 16w 2d and still extremely nauseous. Some days to the point where I can't keep water down. 
I've been taking a remedy that my OB gave me and it works fairly well, I can make it through the day without throwing up and be productive at work. But I don't want to be relying on medicine my entire pregnancy if I don't need. The last week I'd been feeling pretty well so I opted to not take my medicine to see if I really still needed it. 
Needless to say I'm back to feeling miserable and not keeping anything down. Making work difficult. 
Anyone have any remedies or advice for nausea?