Please for the past 5months now my menstruation is...

What is the appropriate treatment?
Since you've done the pregnancy test and it was negative, you should have a medical examination with the doctor to determine the cause of the delay, as the treatment depends on the cause. Treatments such as duphaston pills are usually used for a period to go down and then continue using birth control pills to organize your menstrual cycle after consulting a specialist doctor . But if the cause is identified, such as PCOS or hormonal disorders, birth control pills can be used to regulate the menstrual cycle. It is advised to rest and take enough sleep, exercise regularly to reduce weight, and follow a good diet rich in vitamins and minerals, and avoid stress and psychological pressure as possible

Diagnosis:
It is advised to undergo a medical examination by a gynecologist and obstetrician. Complete blood test for infection. TSH thyroid hormones, as well as testosterone, prolactin, FSH and LH hormones, to detect hormonal disorders. Pelvic ultrasound can also be performed.

Causes of delayed period?
1. Pregnancy
2. Thyroid disease
3. POS
4. Primary ovarian failure
5. Vigrous exercise
6. life stress
7. Using of OCP for a while
8. others

Advice:
It's recommended to see a gyne & obs doctor for further assessment.