Tiadawn is right, it is time to see a doctor. The area you are talking about is where your appendix is, this does not mean it is your appendix for sure that has the problem, it could be another organ or it could be something completely different, That is why Tiadawn is right, you need to have it checked out. Don't freak yourself out, just be seen by a doctor.
I think that you should go get this check out at the doctor's.