Near OBE in school...

[mjolnir_knight]

Sorry for not posting much on this forum or being much of a valuable contribution...  but maybe you all can provide me some answers nonetheless.
I've been having somewhat of a problem lately, and today in school was the third time it happened.
To let you know, I've only TRUELY projected one time, but have had multiple OOBE's, and I remember that one time that I projected on my first try as vividly as if it were yesterday.
I was sitting in English in sixth period and, seeing as it was the third day back to school (and that teacher's first time there of the year, long story) not doing very much.  Just listening her talk to us about rules, the books, how the year would go, yada yada yada.  All of a sudden, I felt my heart starting to beat faster and faster.  At first I thought that I was having a heart attack, but nothing else was happening.  My breathing stayed fairly normal...  Then I started to feel a cool sensation spreading across my face and neck, and I started to feel intense vibrations.  The teacher's voice started to subside, almost as if listening from underwater.  All of these things were things that I experienced in that one waking projection, and countless other tries.  Then, almost as quickly as it started, these symptoms went away, leaving me kinda shaky and physically exhausted.  That is the third time that has happened spontaneously in just a few months.  Once at the movies watching Pirates 3, once just sitting there and watching Deja Vu at my dad's house, and once then in the classroom.  All of them were similar, if not identical, to each other and my one waking astral projection.
What I'm wondering is if that WAS a near OBE, and what caused it.
My hypothesis is that since I haven't really tried to project in quite some time, nor have I been able to, that there has been a buildup of astral energy, so to speak, within me, kinda like filling up a water balloon too much, and these experiences were it escaping.
I don't know what to think.

Thanks,
Patrick