one of my fingers my lionfish got real good and it swelled like crazy and hurt like crazy for a few hours. directly where i got stung was sensitive for a few days. i guess an allergic reaction is always possible but im speaking from experience, it is extremely unpleasant. if you were having an allergic reaction i think the doctors would have been able to tell. hopefully by morning you notice signs of improvement as i imagine you will. you dont need a doctor to prevent infection, basic cleanliness will do that, but if one does set in obviously get it checked.