Alexsandras, on one level your questions suggest an uncertainty and questioning on the path that some kind people are encouraging you to move beyond, or alternatively to investigate as a stimulus to practice.  On another level I appreciate that you have some genuine questions about how changes to perception will affect your science.  And these two perspecctives of course overlap.  The danger is that your science questions divert you away from dharma practice and towards mental proliferation, and this can easily be counterproductive.

So I will try to answer the science question, but as you will see below the true answer will only come through practice. And I encourage you to think about this a bit, then internalise your answer, then drop the questions and get on with the next bit of practice. 

You seem to have some uncertainty about the ontology/phenomenology that you will perceive if you make progress in insight, and yes there are various chages of which your quote above is one.  I wouldn't worry about them - they are all good (except the dark night) and they are ultimately more about phenomenology (the experience of consciousness) than ontology (the nature of 'true' reality). There are a few where you can get stuck for a while and be a spaced out hippy, but I don't think this will be a problem for you.

However, what you will come to realise is that the world (as we perceive it) is just a simulation running on our brain - or as Daniel Ingram more accurately says "on a brain somewhere".  There is no 'real material world' out there, there is just our brain's processing of stimuli.  That is not to say there isn't an external world - there may well be, but we will never directly perceive it and the 'material' component could easily be a property of our processing, rather than a property of the world.  We impute properties to it like 'hardness' but really we have no idea whether this is a true property or just an approximation of something completely different.  This does not mean that nothing exists outside our mind, only that we don't perceive that existence directly.  All this kind of reasoning should be really familliar from quantum physics, right?  It's exacxtly the same kind of unobservable world, that is nonetheless tractable to a bit of inference from observation {edit: observation of our perceptions}. 

So YES you can continue to operate in the world and treat your perceptions as an approximation of 'reality'.  But with practice you will move to the intellectual understanding that your perceived world is just a simulation running on your brain.  And then with more practice you will move to the direct experience of that being the case.  This should help your physics.  In fact, it is much more consistent with your physics than the weird belief that we directly experience a real material world. The unexamined assumption of materiality that is 'normal' life is completely contradictory to everything we know about matter and energy, or philosophy or psychology or neuroscience for that matter.

So yes, wake up!