Could food poisoning cause this?

Ok I woke up monday morning with a sore throat, swollen lymph nodes, typical cold symptoms, and nauseous as can be. I went to the doctor, they did a test for strep throat, it came back negative but they did a blood test because I had strep symptoms. It came back that I had elevated white blood cells so it was probably something like strep and they gave me antibiotics. Today I'm feeling much better (my throat still hurts and i'm a bit congested but I don't feel as sick) and I've talked to the people I had dinner with sunday night. Apparently they all spent the evening throwing up and thought it was food poisoning. Is it possible the food poisoning is what elevated my white blood cell levels and I don't really need the antibiotics? Should I go back to the doctor?