I am not proposing that the Gita or the  Vedas in their entirety comprise a "theory" in the sense that we take the meaning of "theory" when applied to evolution or general relativity.  That would be anachronistic.  What the Vedas and the Gita do provide is a well articulated world view within which such experiences are readily explained.  But this worldview was developed long before  the development of the western scientific worldview.  

I would not rule out the possibility of identifying states of consciousness or attributes of the human mind that could readily explain experiences such as yours, that of Crazy Horse or some of my own and others and that could be related to the Perennial Philosophy described by Huxley in the introduction.  Most work in psychology through Fechner was done in the light of the traditions of the Perennial Philosophy.  However Fechner's observation that sense perception related to sensual stimulation by the logarithm of the stimulus was seized upon by those who followed Fechner to drive Psyche out of Psychology. For most of a century Psyche was entrusted to the care of Procrustes in the guise of scientific reductionism, with some exceptions.  The subject of a future diary, perhaps.  

As the Dutch said while fighting the Spanish: "It is not necessary to have hope in order to persevere."