Here's the thing about OCD thoughts like these. The more you seek reassurance, the more you go over and over in your head what has happened, the more you are telling your brain, "yes! This! Be upset about this!" You are reinforcing it. There are two parts to dealing with an obsessional theme. One is to let the thought come in and just ignore it. Don't "swat" at it. Don't combat it. Don't do any ruminating on it. The other is direct exposure, where you set aside a time to attack it by beating it in it's attempts to scare you. An example would be to say something like "welll, yes, of course I am fake and my whole life is a lie. I am probably the most dishonest person who has ever lived...." this part is extremely difficult and should probably done with a therapist. The idea is that you get your brain so desensitized to the thought that it can't scare you anymore. These are hard things, but from what I have found, they seem to be the only thing that works. I'm sorry you are going through this. I have the religious form and it's the most excruciating thing I've ever gone through. The thing about OCD is that whatever your particular theme is, it is horrific to you. I hope you can move past this and enjoy your life.