That's interesting stuff, Dolazy.
Someone once advised me that, "Wondering if something real is the first step to understanding it and accepting that it could be." One of the hardest thing about unusual experiences like this is trying to interepret them, because we tend to interpret them according to our physical experience, but the same rules don't hold. You are dealing with sensations and manifestations of energy both physical and non-physical, and and it can be confusing.
Alot of what you describe sounds to me like the disassociation of the awareness from the physical. This can lead to astral projection and other profound states once you understand it better. Now, in my book it is entirely possible to encounter non-physical entities in these states, but there are other energies as well. My inclination is that most of what we experience in those states -- until we learn to direct them -- is the result of our intentions. Now, our hopes as well as our fears can manifest intention, so you have to be careful getting into this stuff cause there's stuff out there you probably don't want to attract.
My advice would be to practice empty mind meditation before going into altered awareness. It's like unloading any extra baggage you might be carrying with you. It's less likely that your hidden "can of snake" is going to spring open at the wrong moment.
Plus, it will make it easier to get a "clean" account down on paper before your mind starts making a confused mess of it.
Good luck!
--Andy