It sounds like you should be able to push for a referral given the problems described. If it is impacing sleeping and normal daily activities please highlight it to the doctor. As Chas Tennis says above, if you can go prepared with where you would like to go in terms of referral that would be a good idea. GPs are sometimes a good source of knowledge on specialists and in many cases a bit useless. Unfortunately I only know London and the people I dealt with only seem to be in private practice and it really depends on where you are in the country. I know there are a few decent NHS hospital sports clinics in different London hospitals, but ask around and search online depending on where you are based.