If it's on your right side, i wonder if it might be your appendix? That's definitely something to get checked out, at a free clinic or something.
if you trace a line from the top of your pelvic bone to your belly button, your appendix is near the middle of that. There's such a thing as chronic appendicitis, where it doesn't hurt like hell right away, but goes on as a less intense pain w/ fever and nausea for weeks. It's what I thought I had before I was diagnosed with a kidney infection.
Winston~ Damian~ Twitch ~ Evans