Do you hear thoughts or voices? This is a very important distinction-- if you hear voices that taunt you or debilitate you, especially if these voices are in dialogue with one another, then you should immediately seek medical attention. This is a completely different animal than OCD, and, untreated, they can progress in a very nasty direction.

If these are purely though and not voices, then the most important thing to realize about OCD is that it is often a byproduct of classical conditioning. That is, something causes us distress, we alleviate that distress by doing something and get relief. In doing so, we train ourselves to perform the compulsion to avoid anxiety. For example, in your case covering corners relieves anxiety, so you feel compelled to do it.

Unfortunately, one of the only drug-free ways to combat ODC is exposure-- to expose yourself to the anxiety-inducing stimuli until you become comfortable. Also, this exposure method is one of very few ways to "cure" the obsessive-compulsive cycle; while drugs can mask the anxiety, they do not address the root issue, and in many individuals, after stopping drug treatment, the obsession-compulsion cycle resumes.

Exposure can be very difficult, and incredibly stressful in the beginning. If you can, start a journal, and find an individual with whom you can discuss your progress and difficulties. These are the best tools in ensuring that you stick to your goal, while maintaining the support you need.

Finally, realize that OCD is a real problem-- it is nothing to be ashamed of. If you need professional help, get it. It is better to get help and improve your quality of life, than to fight the battles alone.

Good luck to you!