How could we trust our consciousness ?!

[GrandizerII]

We cannot justify our reliance upon reason, but no other system can justify its base assumptions either.  So in that regard, it is no better and no worse than any contrary belief. 

I agreed with your assessment up to this point.  We justify our reliance on reason with reasons.  Reasons are warranted because they depend on observations.  They are better than simply writing another fantasy novel of interlocking and mutually supporting assumptions.

For me, it's more like if one relied on something else other than reason to acquire knowledge, how would one go about doing that? Frankly, I just can't think of such an alternative method. Hence, my reliance on reason.