Can I just add to the PCOS discussion and say that when you ask for a referral, please ask to be referred to the Endocrinologist and ask if they have someone in mind who specialises in this area. A lot of G.P's like to simply refer to bloodwork, read it and then decide whether to send you for an ultrasound, but an Endocrinologist will ensure you get all of it and is far more specialised in looking at the ultrasound results.
I just had a 4 year merry go round going through this, I was told I had the cystic ovaries, then put on Metformin, then taken off it, then tested again (blood) nothing else, told I probably had the cysts but not the syndrome, back on the drugs, now finally I have just had another ultrasound (ahem, the internal kind) and they now say I don't have it....
I know it's not a question for you yet, but just a heads up if there is any suspicion.
Good Luck, the NHS is all about knowing when to push and knowing when to accept what you're being told.