Cutie, I think *severe* pain should definitely be checked out by a doctor, with no delay.
Here's what I understand to be acceptable dosages of both Tylenol and Motrin for healthy adults, although I do not claim to be an expert and you should check with your doc:
Motrin (ibuprofen): 10mg/kg every 8 hours
Tylenol (acetominophen): 10-15mg/kg every 6 hours
So, if you weigh 60kg (132 pounds) you could take 600mg of Motrin (3 pills)every 8 hours and 900mg of Tylenol (2-3 pills of regular strength Tylenol) every 6 hours.
Hope that helps.
Jenny