Yes, a reproductive endocrinologist is your best bet.
But, just as a note. Even if you get a firm diagnosis, there is no "cure" for PCOS.
You might get a prescription for Metformin, if you have IR -- that will help balance your blood sugar.
You might get put on birth control pills to "balance" your hormones and help the cysts (or you might be told you need surgery!).
They may give you spirolactone (causes birth defects, so not if you're actively trying to conceive) to help with the facial hair growth you have...
But, at the end of the day, weight loss and exercise are going to be your biggest "medicine" bang for the buck. Eating healthy -- and yes, eating diabetic exchanges can work -- and exercising are going to be the best things you can do for you body.
You have to remember you're an experiment of n=1 (one). You will have to find what works for you. Metformin is NOT a weight loss drug. It just stabilizes your blood sugar. BCP are NOT weight loss drugs either. They play around with your hormones.
But, yes, find your reproductive endo, get the "firm" (as firm as PCOS can be!) diagnosis, so you can have some certainty about what's going on with you -- no, it's not in your head!
And continue eating healthy, lots and lots of vegetables!