Hello! My daughter is about 5 months old and has diarrhea for two week…

Hello! My daughter is about 5 months old and has diarrhea for two weeks now. Yesterday she started coughing, fever, and runny nose. We went to an infectious hospital and they said it's on her teeth. Tell me, did anyone have this? It just hurts so much and often, up to 8-9 times a day, and stool changes.