I had a grand theory that the world is just a reflection of my brain. That nothing around me was real, that I was dreaming or dead, I blamed myself for all the worlds problems as well as my own and loved ones pains ( since if I designed this world, then I was creating all of the negativity in the world and all the pain). I truly was consumed by paralyzingly guilt that was entirely illogical.
This caused a lot of serious issues in my life, and my psychologist told me that it was psychosis. It went on for a very long time even on medication.
Mania is usually a sense of being invincible
But to be honest I don't know the difference in delusions and those two.