Hello madam, from the history you have given it is like polycystic ovarian syndrome(PCOS)....It is the most common cause of secondary amenorrhea....It is a heterogenous condition where in there is menstrual irregularity, along with obesity and symptoms of hyperandrogenism like acne, hirsutism....you need to consult a gynaecologist, where in a detaile history and physical examination is carried out, d diagnosis can be made only after doing an ultrasound scans showing polycystic ovaries....In case it is diagnosed as PCOS you may be adviced oral contraceptive pills to regularise your cycle, followed by diet and exercise...A high BMI (body mass index) can also cause menstrual irregularity..a thyroid function is also required to rule out hypothyroidism...I hope I was helpful to you...