exposure therapy is the best way to treat OCD. i would suggest going and getting the book "talking back to OCD". it is basically a treatment plan that takes you through the motions of exposure therapy and you dont nessisarily have to have a t. it is written for a child audience but the treatment ideas themselves can apply to any age. i personally think that its easier to understand because its written for that age audience.

that being said, if you have been through therapy, ask yourself the questions...
- what is OCD telling me?
- what is OCD telling me will happen? (eg i am going to die, i am going to get contanimated, the world is going to end, im being silly here but in all honesty...)
- so what? what is the liklihood that what OCD is telling me is true?
- If I dont obey OCD, what is going to happen?

keep asking and asking. OCD is a liar. thats what it is. it lies. and the sooner you can rest with that and sit through the anxiety it presents, the smaller it will become. the more you expose yourself and ignore what it is telling you, the easier it will become. until hopefully, it gets to the point where you can shrug it off as "oh this is OCD again." and continue about your life.

i suggest getting a t if you dont already tho, because it will help to just have that moral support.