I had heard of binaural beats a little over ten years ago, but this was my first time listening before bed. I had seen the "first time warning" but I had already listened close to 15 minutes and I'm stubborn... 

I'm not terribly sure WHAT was going on, but it felt like I was slowly drifting off to "sleep". When I say slowly, I mean I kept panicking everytime I "dropped" to a new plateau ("descending consciousness"?) after already establishing "comfort". 

Time passed in an absolutely bizarre way. I began feeling "holographic" (which, I understand is not really a way you can feel)...? I "woke up" when the video stopped and felt REALLY weird: like I was lucid dreaming reality. 

Took the headphones off and fell asleep. Had deep, emotionally painful dreams and I feel a little dissociated: further removed from my anger about the things I had dreamt about. 

I'm convinced I just have an overactive imagination.
That's exactly what dreams do -- they help cleanse some of the emotional charge out of our memories.
As to the rest of your experience, sounds like you just need to relax a bit and "allow, allow" :)
And definitely go with the beginner track to give yourself a more gentle experience: http://bit.ly/bineys3beg90sleep
I think I remember saying