Talk to Gynecologist on Pcos, Irregular Periods, Over Weight

Hello, I am 25yrs old and unmarried. I am over weight, have irregular periods have acne and facial hairs. I was diagnosed with PCOS at the age of 22. I went to gynecologist and she prescibed me metformin (neodipar) and birth control pills (diane35), extreme diet and exercise. This treatment was effective in the beginning I lost 10kg weight from 82kg to 72kg.i was on this treatment for 3 years but now it is not effective anymore. I stopped taking diane35 and my periods become irregular again after 2 months and my acne and facial hairs have become worse. I stopped doing extreme diets and exersice but now I gained back all the weight I have lost (I am back to 82kg). My weight just keeps on gaining util and unless I do extreme deit.

I want to ask what do I have to do to get periods regular and lose weight?

Anyhelp would be much appreciated thankyou.