Hello Welcome to HealthcareMagic..
I thank you for posting your query here and I'm definitely going to help you out..
I being a surgeon, we encounter so many such cases day in and day out.
I read your question completely and have understood it well enough..
Please note..
1. I strongly feel that she's having some other pathology or problem apart from the menses thing.
2. Back ache with
Nausea, goes more in favour of Renal Calculus or stone disease.
3. Better to get an
Ultrasound abdomen and pelvis
4. We can come to diagnosis and treat accordingly..
Please get back to me, with reports.
Will be happy to help you out..
Hope this helps, in case you need further assistance, please contact me directly by searching my profile Dr Manjunath Metri.