i can not tell you if this is ocd related, it never happened to me. but at least you can see that when you are in a good place mentally that you understand that this does not make sense and it is not logical , remember this feeling of being calm about the situation.
there fore when you become in a bad way mentally and start believing it again, remember the feeling you had when you were fine mentally feeling good about your self,the calm feeling you had inside that it all was illogical and that everything is actually okay.
this is your mind ,your body , you are in control of it, you and you only.
take care.