Incoherent Meditations
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!