Ma'am
40kg , 5feet 5inches - BMI - 14.7
You are underweight and nutritionally undernourished.
You seem to have
thyroid problem and complaints mentioned in your question indicate towards menstrual hormonal disturbances.
You need to work on food and nutrition to fix your issues.
Next Steps
Consult holistic healthcare provider to heal yourself.
Health Tips
Focus on healing rather than suppressing your symptoms with medicines.
You can connect with us , we work on fixing root cause of diseases.