I'm very sorry to say that if it's true that you have ODC, at the present time, there is no cure for it. But you can manage it.
One of the main features of OCD is doubt, it was even called '' the doubting disease '' during the 19th century. You doubt the most basic things and some even go on to doubt their sanity and perceptions. But there are many things you can do to have it under control and live a relatively normal life.
You have to deal with the anxiety those thoughts make you feel, and not with the actual threat you think you're facing. For example, once you clean your room, you'll start thinking that it's not clean enough and that you have to clean it once again, and by doing that you're dealing with what your thoughts are making you fear, that the room might be actually dirty while it's not. You have to start dealing with the thoughts themselves and not with what they're telling you to repeat and do all over again. These thoughts are all symptoms of anxiety, and they can make you feel you're going to have a fire, your family will be murdered, you're going to die in an accident...etc. It doesn't matter what the content of these thoughts is, they all have the same effect on you. They make you anxious.
So the most important thing to do is to start dealing with the anxiety that these thoughts make you feel, and not with the actual content of these thoughts. I really hope you get better soon.