thanks for using health care magic.
From what you have described, its likely that its an ovarian cyst
. Ovarian cyst could be functional or non functional. Functional cyst rarely are a problem and resolve on their own while non functional cysts may present with complications such as increased size, torsion, hemorrhage and cancerisation.
Functional cyst do not need surgery where as nonfunctional cyst due to the potential of complicating require surgery especially when their size is increased.
Pains resulting from ovarian cyst is at the level of the pelvis and on one side and not in the vagina.
I will advise you revisit your gyns for precision of the type of cyst, size and re-evaluation of the pain (location, intensity, associated signs etc) in order to have an appropriate management plan.
Best regards and hope this helps you.