It is common for someone with PCOS to have irregular (infrequent) and often time heavy periods, but when there is an element of pain during the periods, it is necessary to rule out other causes.
As such, it is appropriate to review your diagnosis of PCOS. Long-term use of Diane-35 / oral contraceptives require regular surveillance by your doctor or gynecologist. Some gynecologists will avoid continuing oral contraceptives in women above the mid-thirties; they would explore other methods of family planning or strategies to manage menstrual disorders.
Studies in the last three decades have been controversial regarding the risk of breast cancer and the use of oral contraceptives. However, the recent nationwide cohort study in Denmark, reported in the New England Journal of Medicine in 2017, high-lighted a small increase of breast cancer risk among women who are either current or recent users of hormonal contraceptives, and the risk tends to be higher with more than five years of use.
The study emphasised that the absolute risk-rise is small. Your dermatologist will be able to offer you non-hormonal therapies to prevent or treat your possible recurrence of cystic acne if you were to take a break from Diane-35. Your gynaecologist will review your PCOS diagnosis and discuss management of menstrual disorders according to your individual characteristics (such as familial tendency to hormone related cancers, physical built, lifestyle and fertility needs)."