Blizzard see your doctor to get a referral pronto if that is what you expect - I can confirm it does indeed take bloody ages in the UK.
I was falling apart last October when my husband marched me to the GP, a referral was put in that day. I didn't see the consultant until January and had the sleep study that week. I had my follow up, wait for it, last Wednesday. 19th August. I was given my diagnosis and CPAP then - they confirmed then I have severe OSA!