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No, it is unwise to take two antidepressants at once because of the danger of Serotonin Syndrome. This is a potentially life-threatening reaction, so this is a serious matter.
However, there is anecdotal evidence that Cymbalta can also be effective for OCD, so it may be worth switching to get the added pain relief that Cymbalta offers. Here's a link that shows that some people have found OCD help with Cymbalta: http://www.revolutionhealth.com/drugs-treatments/rating/cymbalta-for-obsessive-compulsive-disorder-ocd