If you actually have psychosis you probably won't know it someone else will have to point it out to you because impaired cognition is one of the symptoms. Are you hearing voices? Smelling or seeing things that aren't there. Think you're God or invincible, alternately think someone you love is the devil or working with the devil. Feel you are psychic or telepathic.

Anyone out to get you like the government or the men in black. Poison in your food or water?

...from what I understand a lot of bipolar psychosis is grandiose because it typically occurs with mania so think feeling all powerful...I can heal the world with just a touch.