That is an interesting and unique take. And like I said, something no one has ever theorized before - at least not that I've ever read. Though thinking outside the box is often your forte.
I do think, though, that a different and valid theory is that, except for Michael's terror, the deathlike symptoms, the supposed death, and the whole aftermath was all pretense - especially for Julia's sake - and as soon as Julia was gone, Michael immediately went back to his normal self, or at least as normal as Michael ever gets.
And Michael's reaction could easily be explained as intense fear in taking the next step in his evolution, particularly when he was having such a fine time (if one can call being so dastardly "fine"
) in his present stage. Adolescence is an emotional time - and adolescents often experience anxiety about the uncertainty of growing up and facing the next stage in their lives. In Michael's case, that anxiety was taken to an intense level. But then, when adolescence lasts for mere weeks rather than years, it's even more understandable why Michael could fear moving on to the next stage.
And as a side note: if I knew or even suspected that in my next stage of life I was going to transform into a cheap, insufferable pig, I'd be intensely fearful of the process too!