I haven't read the graphic novel you mentioned, but it sure looks interesting. The art is incredible! I can see how it would send you to a place of deep thought and introspection... and even cause an epiphany or two!
As for your experience... I think I already mentioned how familiar it sounded to me.
I've had very similar experiences to yours over the course of my life. A few, in particular, that were quite paradigm shifting.
You mentioned coming to the conclusion that you yourself were God. And I say good for you!
I think it's the world that is upside down on this one—thinking there's one unique almighty being in charge of everything—pfft, lol—now that's crazy! (Yeah, there's other religions with their own flavour of insanity, but this one is convenient, so I'll leave the rest for the readers to figure out.)
It is not at all surprising to me that you've come to this conclusion while reading a graphic novel that has strong elements of mythology, particularly Greek and Egyptian. While I haven't read it, those religions are much more aligned with the idea that powers lie within us rather than without.
I must say... I've become quite frustrated with my experience with the diagnosis and treatment of 'bipolar'. It seems the industry is much more concerned with ticking boxes in a checklist and prescribing medication... rather than forming an actual understanding of the person and their individual experience.
If you experienced this... you experienced this. Call it whatever you like—mania, hypomania, a spiritual experience, an epiphany, a revelation, a paradigm shift, or a religious experience—or just a great f*ing book. It doesn't matter much except if you're seeking external guidance and really struggle with managing these feelings.
In which case, look for answers... but be careful thinking that other people might have them.
It's entirely possible that the answer you found in the book has more basis in reality than the 'diagnosis' you've received. (I'll probably cop some flack for saying that haha!)
It's my sincere opinion that we're all Gods within the scope of our understanding and control of the world/universe around us. Very small gods... but gods none the less. And that's actually really damn empowering.
So... use your powers for good 🙂
~ K
p.s. You might find it interesting to do a bit of research into some alternative theories of mind around the nature of consciousness. It can get pretty abstract... but one of my favourite ideas comes from Julian Jaynes (1920-1997) - a psychology professor at Yale & Prinston for over 25 years. I won't spoil the ride for you, but let's just say that, for me anyway, the insights have been (and still are) just as mind blowing.