The first step is to make an appointment with your GP. Your doctor will then arrange to determine whether or not you have the disorder and from there which services would aid your recovery.
OCD Action have very helpfully described how you can access services and your right to choose who treats your OCD (with some criteria) please click on the link below for more details:
You can also contact The Samaritans.
The Samaritans tel: 116 123 (this is a free telephone number and will not appear on the phone bill)