Lack of periods can be related to many causes like
thyroid hormone imbalance, PCOS,
FSH and
LH hormone imbalance, Obesity, stress etc.
It is very necessary for you to get cured to understand what's the cause.
Secondly, a thorough case taking to understand your physical and general make up so that the most similar remedy for you can be identified.
Thirdly, if there is any supplemental and dietary changes are required then that needs to be made aware of as well.
Next Steps
Consult a physician of your choice and get the treatment started.
Normally it does take sometime to get the body to react to the medicine because homeopathic medicine also has a reaction time, so it is important to stick to the course of treatment and change it, if required results are not showing up.