Hi, Welcome to Health care magic forum.
You are 22 years of age girl,5.4 height, and 40 kg, weight, it is absurd, you can increase by 20 kg more.
I advise you to consult a physician for diagnosis, of any chronic diseases,
anemia, deficiencies,genetic factor, etc.
I usually prescribe to my patient with such symptoms injection of anabolic
steroids periodically,
protein supplements, multivitamins,and hematinics.
Take more of calories, fats, fries, green leafy vegetables, pulses, sprouts and protein rich foods.
Wishing for a quick and complete recovery. Thank you.