Something similar happened to me. It's just weird. I had a lot of heartburn and found it was best to eat a lot of small, frequent meals - not too much at one sitting, and I never allowed myself to get hungry. That meant carrying a variety of small snacks with me all the time. My oddities were that I could open a block of Swiss cheese but couldn't eat it melted (as in a quiche or omelette) - something about the texture and maybe the smell. Tuna was the opposite - I could eat it, but I couldn't open the can or be in the room when my husband opened it. Something about the rush of odor when the lid was lifted.
My advice it to try different foods and see what happens. A friend lived on lightly salted almonds - kept them in her car and just ate 3 or 4 as needed.
Some people say it's the hormones, others say the baby presses on the stomach and squishes it upwards, changing the way food sits in there and how the acids come back up into the throat. I've since found something that's awesome for reflux, and it's proven safe for pregnant and nursing mothers, even kids. You could try a patented product to settle your stomach - patents are rare in foods and they indicate proven data for safety, efficacy and uniqueness.
Otherwise I'd say to eat a little of everything, try not to worry about whether it's appetizing or not but just whether it's semi-nutritious, and wait it out. By the time you figure this out, hopefully the phase will have passed! Good luck.