The NHS in England has published a Constitution which outlines your rights: https://www.gov.uk/government/publications/the-nhs-constitution-for-england/the-nhs-constitution-for-england
If you feel that your GP, Hospital or Sleep Clinic are not meeting the commitments made in this publication this webpage outlines how to complain: https://www.gov.uk/government/publications/the-nhs-constitution-for-england/how-do-i-give-feedback-or-make-a-complaint-about-an-nhs-service
NB. To our knowledge, NHS Scotland, Wales and Northern Ireland do not have such a Constitution and the rights outlined above do not apply
We have an excellent range of leaflets that explain the condition and its implications. The leaflets are available in the Downloads area here.