I think I have OCD. What next?

Here are some of my symptoms.

-Have posted the same question or a variation on Yahoo Answers and various forums over 400 times over 3 years. (http://ca.answers.yahoo.com/question/in ... 821AAzqtk3)
-Been thinking about content of said question 24/7 for the last almost 3 years. Can't get over it.
-Contest tongue clicking (often(but not just) when I pass the beginning and the end of a road/sidewalk I will do this - I have NO idea why)
-avoiding cracks on sidewalks, left foot then right, frustration when the pattern is broken
-when I was about 10-12 I would add 'I swear to god' to thoughts (such as 'i'll pass this test, etc) then quickly say 'No!' over and over and over again for likely a year.
-in grade 12 I worried constantly about death and would compulsively ask about people's thoughts on life/death/afterlife, etc.
-4 years ago I was CONVINCED I had cancer, and it ate up my thoughts each and every day, checking lymph nodes CONSTANTLY
-about 3 years ago my roommate became pregnant and I was convinced that somehow it was me (this is ridiculous and disturbing in many ways, as I was convinced that somehow some of my bodily fluid had ended up on my hands and into the shower or something... I know how silly this sounds but I am sure that you guys will understand)
- picking/ripping off of nails, etc., cracking knuckles,
-worrying about shutting off ovens, etc. once I leave to the point I have to go home and check or it will drive me mad
-worrying about offending or hurting others in totally innocent situations (once I was flirting with a girl I had been on a few dates with and we pretended to 'fight' ... I was convinced she was offended for DAYS and then I asked her- she said I was 'hilarious'- and was serious.
-Need pod casts/movies about conspiracy to sleep, feel strange if they aren't on, no matter that they disturb my sleep pattern and likely contribute to my depression.
- Paranoia from an early age that my friends weren't being honest to me, that they had alternative motives or that they just hung around with me because they felt they had to
- Constant feelings of inferiority, failure, etc. insults, self- hating statements and unwanted thoughts stuck on repeat

If I have OCD, what are the first steps in diagnosis and treatment? I've been to therapy before, but had to move away and can't get in for an intake session till Thursday. Any and all advice is greatly apperciated. I've been suffering for a long time, and I've finally accepted that OCD may very well be a real possiblity.

Hi, are you a Tottenham fan? I'm an Everton fan myself, but i'm from Ireland. Who will you be seeing on Thursday? I have a diagnosis of OCD and from what I have read it seems as if you very much have it too. How I eventually got diagnosed was by first going to my GP. She then referred me to a psychiatrist, and after a few sessions with him, he diagnosed OCD. I waas then passed to a therapist who worked with me for around a year, seeing me once every two months or so. So, you should always go to your GP first.

By the way, I DO understand you on the pregnancy thing - I've had that same fear, but many years ago. I never had a fear that I had cancer, but oddly enough i'm doing research in cancer now.

Kevin