Dear posylady,
Wow! Some spend years trying to get that kind of experience with meditating and such. So visually. Sounds like you got jumped in.
Such experiences can be scary especially when it's your first go at one so gripping. From your post it seems that your new experince anxiety caused you to latched onto the snake thing in effort the catagorize the freaky visual experience. Pperhaps were seeing sacred geometry in motion or something along those lines. It does not sound like you were having an the preliminaries of a OOBE by reading your post. Sounds more like you were seeing your energetic insides.
While getting onto meditation mode next I would humbly suggest that you set yourself to avoid reacting emotionally to what you see. You need only observe so be a passive observer.
Namaste,
Michael
