This sounds like a possible problem with the insulin levels in the dog. This could be from an insulin secreting tumor of the pancreas.
Hypoglycemia can also be a sign of Addisons disease
www.marvistavet.com/html/addison_s_disease.html
You can read about testing and treatment to deterimine the cause and resolution of hypoglycemia here
http://www.petplace.com/dogs/hypoglycemia-in-dogs/page3.aspx
Scroll down through the whole page for info.
The blood in the urine could be from infection due to the disruption in the system for processing glucose.
I think you will find the hypoglycemia page will answer a lot of questions for you.
Hope your dog pulls through OK!
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