Well , pain in the tailbone area may not be due to cyst
.But pain in the left side of your pelvis can be caused bu a pelvic pathology or an ovarian pathology. But since it is the first time you can take few antispasmodics, since pain in that area can be due to so many causes.If it recurs again or don't subside , you may have to do a pelvic scan with TVS.You may also have to do a stool routine and microscopic test to rule out colitis
, if you are having mucoid stools.
I tell you madam that all cysts in the ovary need not require a surgical treatment
as many of them are functional ones and subside as such.so don't worry.good luck