Hello,
Thank you for your query at DoctorSpring.com
I am certainly concerned about the pain you are having.
There is a possibility that you are having mild appendicitis. You should certainly visit emergency to rule it out.
The other possibility is of your having some muscle injury. But please get yourself evaluated first to rule out appendicitis.
A visit to emergency room is certainly mandated.
Feel free to discuss further,
Rajiv Goel