I would look into neurofeedback for OCD. People with this condition have dominant excessively high brainwave frequencies, which keep them in a state of hypervigilance. If you don't have biofeedback/neurofeedback clinics in your area, it might help to listen to relaxation recordings.
The Alpha-Stim is also supposed to help with OCD. You can use it at home. There's tons of info about the Alpha-Stim if you google it.