Good night ? The child's temperature suddenly rose to 38.6, he didn't …

Good night ? The child's temperature suddenly rose to 38.6, he didn't fuss, just slumped down, couldn't even lift his head. In general, helpless. Husband called an ambulance, the doctor examined him for a long time, breathing is normal, the abdomen was touched, there were no reactions. The child did not show any signs of discomfort, said it is not related to the stomach, the throat is red, for several days the son has been sucking and gnawing on the thumb, saliva flows in a stream, and yesterday I noticed that the breast is squeezing the nipple with force, until painful. The doctor herself does not know what it is. She looked into the mouth, swollen gums, she