Morning (All-the-Time) Sickness

Ever since Sunday, I have pretty much felt continuous nausea. That's a slight exaggeration. Every couple of hours I get a feeling of normalcy, but then I'm hungry which leads to nausea. Even before getting pregnant I normally eat every 3 hours. Now I'm hungry every 2 hours. On top of that I'm always thirsty. I wonder how long this will last.