Hey EM
If you see your Dr they will give you a cd21 Progeterone test for around three months to initalise a pattern of whether you are ovualting and they will also test within that the levels of all different hormines like your Male Adrogen Index which i think is the amount of testosterone you have and also your levles of estogen etc too. I was diagnoed by my Gp by blood only but then Undiagnosed by my Fertility Consultant. The dr maybe also send you for a scan to check for Cysts to see if there is any present.
Some Dr's may not doing any of this they may send you straight to see a Gynaeologist it just depends on the dr really... My advice would be to go and tell the dr that you think you have PCOS and you would like to be tested for it to make sure you are/arent they can say no dependent on the symptoms you have but i think most of them will be sympathetic and will do it. I has Charts from taking my tempreture to take with me cos id be doing my body temp for months and they all showed no ovualtion so with that in my hand she had to test me cos she has no choice really.
Asw for metaformin is it widly given out by both Gp's and Gynae's etc as its used to treat both PCOS and Diabeties or sometimes both if u suffer from both... My mum takes Metaformin for diabeties and my sister was taking it for Diabeites & PCOS as she was trying to concieve baby #2 but now she is pregnant so she not on the metaformin anymore so i would not worry about metaformin too much if you need it then the chance are you will get it without a problem.
I hope that helps hunni , if you have any other questions feel free to message me....Which part of London do you live in im in South London.
Teresa