thank you for your query.
definitely need to be investigated.
your doctor has correctly prescribed the necessary tests to you.
Reasons for irregular periods could be - stress, anxiety, rapid weight gain or rapid weight loss
, emotional trauma, frequent travelling, thyroid hormone imbalance
, polycystic ovaries
, endometrial lesions etc.
You need to have the relevant blood tests done.
i do not understand how doing the tests will harm you.
And you cannot be afraid of medication - it will only help you.
Follow professional medical advice
, and not what your ' friend ' tells you.
Backache could be because of pre menstrual symptoms, or calcium and vitamin D deficiency.