That sounds VERY similar to what I've experienced this pregnancy. Turns out it was related to acid indigestion/acid reflux. The reflux causes the food to come back up your throat, but doesn't always cause heartburn like you might expect.
The ONLY thing that helped (and I tried lots of remedies!) was when my dr prescribed acid-reducing pills after I had explained my symptoms to him. First I was on Aciphex, which worked great but was pretty expensive. Now I'm on pantoprazole, which is a generic. It doesn't work quite as well, but it's still better than anything else out there I tried. I think both are called PPIs - proton pump inhibitors - so you have to take them every day to maintain your stomach.
I'd definitely talk to your dr about it, because between the acid & the nausea I've had, I couldn't eat hardly a THING and I was constantly miserable. I'm not thrilled about being on another medication, but it's definitely been worth it.