2 years post-op, extreme nausea - Any ideas?

I'm just over 2 years post-op and have been experiencing really bad nausea the past two days. Yesterday, I ate half of my usual Monday lunch of chili, started having symptoms of dumping and promptly went to the bathroom and threw it up. I was fine at dinner last night so wrote it off to the chili maybe being old since it had been a holiday weekend. This morning, I had string cheese for breakfast and had a similar nausea but was able to keep it down. And again at lunch today, after eating two bites of boneless skinless chicken breast and two bites of cheese tortellini, I was ready to toss my cookies again. I have not felt this horrible since I was 3-5 weeks post-op. It is not happening with everything I eat - I just had some multi-grain pita chips without a problem - so I don't believe it could be a stricture. I came home and took a pregnancy test. Not pregnant (Thank God!!), so that's not it either. Any ideas on what's making me feel so crappy?

How does water taste?

Have you had any bone surgery or small accidents lately where you could've bumped your head?

Water tastes fine. I drank 7 bottles today. I had plastics on 9/20, but no bone surgeries. Unless you count having my teeth cleaned 15 days ago. I'm a notorious klutz (my friends insist I should wear a helmet at all times), but I don't remember bumping my head lately. My recent injuries have been limited to abrasions on my elbows, a bruise on my knee and a bruise on my shoulder. Fortunately, I didn't have any problems with dinner tonight. I'm going to try string cheese for breakfast again in the morning, but if it starts feeling like it's going to be a problem, I'll have a protein shake with me as a back up.

Well, water tasting decent pretty well rules out a marginal ulcer.

And I was sniffing around BPPV, which is a specific form of vertigo which is fixable by ENT. I had this from, of all things, foot surgery. I couldn't eat or drink, had dry heaves, dropped down to 101 lbs and it all started with foot surgrey. I could NOT figure how what foot surgery had to do with dizziness, this awful nausea (often having nothing to do with food), total loss of interest in ingesting anything at all.

But it was all in my ear. Once fixed, appetite and ability to eat (and normal wt) returned. That'd be post-op normal, not pre-op!