Hello,
Polycystic ovarian syndrome (PCO) is a condition of unknown cause in which there may be obesity a male pattern of excessive hair growth, infertility, and abnormal hormonal disturbances that are detectable by blood tests.
Malfunction of a particular part of the brain, called the hypothalamus, can cause oligomenorrhea (loss of the periods).
You gain weight probably because of the domination of estrogen as a result of not ovulating regularly. Estrogen retains water in the body. You may need to be put on progesteron hormone pill or bcp to regulate your period.
Please click HERE for a positive FEEDBACK rating and also please click the green ACCEPT button if my answer is helpful to you. A bonus would be encouraging. If you need more help please feel free to ask. Take care.