What can I do if there was a dead frog in my salad?

After opening a salad I bought at the store, plating it and taking a bite, I noticed it didn't taste right. I bit down on something and immediately spit it out to see there was a dead frog. I was so nauseated that I threw up. I went to the doctor and they told me that, although I was extremely distressed, they wouldn't be able to tell me if there were going to be any lasting damage (like salmonella). I still have fears that I am going to open my food, which I assume should be clean, and find something I shouldn't. This whole ordeal has really frassled my mind.