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Oil in coolant, Extreme pressure in coolant tank, Hard radiator hose. High oil pressure(70-80psi on highway). HG? AHHHHHHHHHHHHHHH
 

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If the upper radiator hose is hard in the morning after sitting and the reservoir has pressure on it as well then your head gaskets have gone. My 05 had that issue. Are you losing coolant too?
 

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Just had this same issue myself in my 06. When it was pulled apart for gaskets they discovered the excess cylinder pressure from the coolant vaporization had actually fractured the top piston ring and scored cylinder #7 pretty good. Had to buy an entire new GM reman engine to the tune of $7k plus installation. All at only 80k miles. Just hope you don't have to go thru the same pain. Good luck.
 
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