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Hello, I'm Dr. Deb and will do my best to help you today.
I'm sorry that your cat is experiencing these gastrointestinal issues. I tend to agree with your vet about the possible causes for her issues although it's often difficult to specifically pinpoint these conditions without further testing.
Some patients can develop esophagitis which may be why she's swallowing and not eating or she may still be nauseous even if she's not actively vomiting now.
You can give her over the counter Pepcid AC (Famotidine) which may help if this is the case. The dose would be 1/4th of a 10 mg tablet twice a day.
Since cats are very sensitive to many over the counter products which can be used for diarrhea in dogs (or humans for that matter), I wouldn't suggest any medications such as Pepto Bismol. However, probiotics may help with her looser stool issues. Forti Flora is a good product which may be available at local pet or grain stores.
I hope this helps and that you see improvement soon. Deb.
I'm just following up on your cat. How is she doing? Deb