I didn't think of myself as a god per se, just an immortal being of purpose.

In this delusion, the immortality is because I can cure disease and stop aging in my body (and only my body, which is why I am not sure this is god like) using my mind. I don't dare tell anyone because they would not believe me and I could end up in a mental hospital for all eternity and I am going to be needed for something important (not clear what). When I become a reasonable person again, I have a hard time with realizing I really thought that because that is about as severe as it gets for me in recent years. It sends me crashing down pretty deep when it ends because I always hope that won't ever happen again.