Impregnated By Thor's Hammer - Thurisaz

Ifing the river is called 
I will cross over 
the bridge 
impregnated 
by your hammer 
expectant 
in the storm 
you torment and fester 
until chaos 
births fertility 
Thurisaz 
my firstborn 
belongs to you
The Thurisaz poem is one of the 33 original rune poems created by Ingrid Kincaid, the Rune Woman.  These poems were first published in her limited edition, completely hand made book (un) familiar.

Thurisaz in the chaos

(un) familiar Rune cards

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There’s a river that separates the realm of the gods from the land of the giants.  Ifing the river is called.  Ifing, the River of Doubt.  It runs so swiftly that ice never forms on it.  It runs so swiftly it’s difficult to cross.
Why does there need to be a separation between the gods and the giants?  Why would this separation be called Doubt?  And how is it that Thor crosses over so easily?  He’s most definitely giant through his mother’s line.  She is Jord, giantess of earth and soil, land and crops, and the daughter of Nott, the giantess of Night.
Thor most often gets placed in the Aesir pantheon along side Odin but rarely does anyone remember that he is more than half giant.  So is Odin for that matter.  And they both cross over the river into other realms. 
Thor is a storm god much loved and honored by the people.  He is roaring thunder and flashes of lightning that strike the earth and fertilize the soil. His hammer is used in the blessing rituals of new brides, imparting fertility.  His hammer is hung on the plow as it turns the soil in spring thus assuring abundant crops for the coming year.  
When Thor arrives in the storm, in his chariot drawn by goats, does he use his hammer to impregnate his mother?  Is this yet another story of the mother who gives birth to a son who becomes her lover?
The frost giants are called Thurs so perhaps Thurisaz is the rune of these giants.  If so, they appeared at the very beginning out of the chaos of fire and ice.  Does Thurisaz carry with it some of the chaos that exists at the moment of emerging?  When it shows itself randomly in your life or in a reading it might do well to ponder.
What is my river of doubt?  Which side of the river am I on?  Where am I the most comfortable?  How easy is it for me to cross over?  What impregnates me and when I give birth, who claims my firstborn?  Do I deny or ignore the parts of me that carry the lineage of the giants of chaos?  Do I favor instead only the parts that the high gods approve?