Never Hungry!

Everyone keeps talking about pregnancy hunger and I'm over here always feeling so uncomfortably full even when I am hungry that I have to force myself to eat. And if I eat more than a small snack, I throw up! Is anyone else dealing with this and what do you do?
I am 18+5 and hardly showing. I've gained a total of 5 pounds, which I'm not too concerned about.... yet. 
I've already cut portions and I haven't eaten a full meal in months!! 5 hours ago I had a peanut butter sandwich and I still feel like I finished an entire pancake platter less than 20 min ago. 
I haven't the slightest idea where this "eating for two" came from, I can hardly even eat for one! I'm worried because I do still feel hungry and I know I need to eat to fuel my little one's growth, it just feels like there is no room!! Just wondering what anyone else who's dealing with this does?