Last time I gave a reasoned response to one of these questions or topics I was chided as being too reasonable, a prick who wants to ruin the fun of talking about lofty things. I'll risk that and go on by saying I'm happy for you being able to experience this kind of phenomenon. However, in saying that I can in now way endorse your idea that your experience must be god.
It seems to me clear that there are many physiological or psychological phenomenon that cannot currently be explained or are not available to you. It happens all the time with chemically un-induced, naturally occurring hallucinations as well as illusions such as seeing ghosts (either physical or psychological illusion). As Sam Harris says, you can go into a cave for a year, have wonderful mystical experiences (many have) however it gives no or very little credence to the god hypothesis. If you were brought up in India you very well might have considered that feeling as being the spirit of Vishnu and Krishna or perhaps you temporarily experienced the concepts of nirvana or nibbana.
To me such experiences can be likened to a long and drawn out orgasm. Perhaps not exactly however I believe it is possible to explain them biologically or at least psychologically. The orgasm is a wonderful experience that seems to transcend all reason or psychology and the world itself, a bliss of perfection. Could this not have been an unexpected mental orgasm? Perhaps not, but to say it must be god is to be intellectually lazy.(Not that I'm saying you make this claim, just my feelings on if you were to)