In OCD normally trying to stop obsessive thoughts is a chore at first, but it can be learned...that is basically the goal of CBD.

If you're unable to see a doctor, I'd say analyze on your own how much your obessive thoughts are causing you anxiety and otherwise interfering with your life. Remember, no mental illness can be "cured", but they can be managed. If you can manage things yourself, that's good, though it probably would be wise to see a doctor if/when you get the chance.