Talk to Gynecologist on Irregular Periods

Salam, From past 4 months I am having irregular periods. Sometimes I have menstruation cycle of 35 days, sometimes 50 and sometimes 40. my period was due on 26th January but uptill now I didn't get my period. I am having breast pain and high functioning mood swings and depression. I am feeling deep hearted. I am also having headache and acne breakout (only 1 acne). I haven't noticed any change in my weight nor I have noticed abnormal hair growth. can you help me and figure out what is happening to my menstruation cycle. how to cure messed up menstruation cycle. I am daily taking vitamin C supplement but it's not working. please help