Incoherent Meditations Seemingly, despite my questions, I still am encountering great difficulties. I've been meditating for perhaps 1-2 years in a haphazard fashion, on the metro, walking places, while doing things. Perhaps the word "meditation" is inappropriate, it was more like a mindfulness or perhaps a mixture of different types of reasoning, contemplation and attempts at realizing certain facts. Overall, I feel like I've accomplished absolutely nothing in these two years, and that I've wasted much time. 

I would say the only thing I want now is to be able to stop all this, whether to meditate properly, or even to understand how to reverse the conditioning that I unwittingly imposed upon myself. I'm asking if anyone knows or conjectures a means by which I could achieve this, and perhaps some tips on what I should avoid doing to create this massive incoherence in my mind.
It sounds like you are experiencing runaway mindfulness.  At the very least, you're falling into discursive thought (as you say "reasoning" and attempts at "realizing certain facts").  Neither of those is really Buddhist in practice.  They're also not going to get you any closer to true realization.  I really think you need to slow things down.  A little samatha might go a long way in settling your mind and help keep it a bit more collected.  Once you've established some degree of calm, you might have more success with a mindfulness practice.  

And like Suminda says, make sure you learn correct technique before you have at it again!