Well, it seems that you are worried, otherwise you would not have written in for advice.
I am not a doctor, but you have had this for over a week and it has not gone away. It is not normal to be in that much pain without some reason for it.
The best thing to do is to book an appointment to see your doctor, tell him your symptoms and see what he says.
Let me know how you get on.
Best wishes.
Make an appointment to see your doctor.