Hi thanks for your question.
Your right in thinking that overain cyst
could be responsible for your menorrhagia(irregular and heavy periods
).Overain cyst do cause sever menorrhagia.Your low back pain
and pain abdomen could be due to menorrhagia.Consult your gynaecologist,she may prescribe you drugs for menorrhagia and pain.
With control of your menorrhagia hopefully pain will settle down.
Ovulation is very painful in some women
Hope this answers your question.