We don't know how to handle everything and if it's necessary to consult a doctor.

Yes, it is important to consult a doctor if your child is experiencing symptoms like a stuffy or runny nose, especially if there are concerns about ingredients in toothpaste causing mouth lesions. Decreased appetite and energy levels are normal after an illness, and offering acetaminophen for pain relief and plenty of fluids can help with recovery. These symptoms typically resolve on their own within 7 to 10 days.