Sounds like either an ovarian cyst or appendicitis. Pain making you bend over definitely is what a cyst can do. But if you start to get a lot of abdominal pain, it could also be your appendix.
It could just be cramps if you are near your period time. However, I have experienced the same pain you are describing and it ended up being an ovarian cyst.
So please, head in to see your doctor!
Goodluck and Best wishes! :)