I think this is a common issue, dealing with depression and OCD. One question is 'which is the primary issue?' There seems to be two groups that I have seen on these forums:
Those with underlying depression that drives the OCD behaviours
Those who suffer with debilitating OCD that that drives the depression
Which group would you say that you fit into? Or maybe both goups - it can become a very challenging circle.
For me personally, the depression is the primary condition and that has to be dealt with first. Once the mood lifts then the OCD behaviours can reduce, either due to the mood lift or with therapy added.