Hi, I have been having the same thing. it was so bad yesterday that i thought of a heating pad but thought if it is appendix would rupture. I did have an ovarian cyst tears ago and they can come and go. I plan to go to my Dr. and will let you know what I find out...although here in canada, i have to wait to see one. Let me know what you find out.
It could also be an ovarian cyst. Usually someone with appendicitis will have nausea and/or vomiting.