Hypochondriac Mother needs advice

My toddler got his front tooth pulled yesterday in the morning and this morning woke up with a cough and kinda gagging on his spit and has a runny nose. I’m a bit of a hypochondriac so now ima kinda freaking out if it’s related to his tooth being pulled or he just got sick n it’s a coincidence. He keeps coughing and sniffing and idk what I should do to help him or if I should call his doctors about it because I’m scared tbh. Please give me advice.

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