Hi, thanks for using HCM. I feel that you have waited long enough for menses to return after surgery and need further evaluation now to determine any underlying cause. I would like to know how was the menstrual pattern before surgery. If your periods were regular then and this cyst was a simple one, a normal period should have ensued by now. The common reasons for irregular periods are hormonal disturbances or ovarian cysts. Other common reasons for not having periods or irregular periods are stress, obesity and multiple small cysts in ovaries. As your LDL is high, do consider if any of the above factors is present that may affect your period. The high LDL level can be easily controlled by simple measures like eating more fruits and greens as well as cutting down on fat containing food, light exercise and certain drugs like statins that help lower down cholesterol. Regarding the absence of periods, if a similar patient came to my clinic I would do a pregnancy test followed by a hormonal evaluation of the blood to check if the hormone levels were allright. I hope this was helpful. Take care.