PCOS is a pretty complex illness. I was diagnosed in 1981 - it was an easy diagnosis as I was really hairy and tubby.
You would be best going to see your doctor, tell him that you think you have PCOS and he/she will do tests.
If you have you really need to watch your diet. I put on a horrendous amount of weight, and have had severe problems with my blood sugar levels.
There is much that can be done in the form of medication and your doctor will advise you of your options.
Best wishes
Susan