Hi there!
So I studied biochemistry--I don't have an MD (and MDs out there?) so I will give it my best shot!
Typically, epinephrine and norepinephrine are not released chronically. They are rather exhaustive on the body and aren't meant to hang around.
After googling that cancer you mentioned, the effects of norepinephrine would be more pronounced, as epinephrine biosynthesis would occur to a lesser (but greater than the physiological norm) extent.
But for the sake of your story, lets assume that your reader doesn't have a wikipedia's worth of knowledge on the pathology's fine details (heck, I didn't, and I did rather well in physiology).
Symptoms that might be worth including: Remember, if you're dealing with an overload of an acute stress response, the body is going undergo decreased appetite (but that may change after a period of increased basal metabolic rate), decreased immune function, and other tiny things. Whatever, isn't necessary to fighting or flighting is going to be disregarded.
The subject would most likely get the shakes, glycogen stores would be depleted (so he will use up readily available forms of energy rather fast), also, you got the high blood pressure down, but you also get restricted blood flow to the periphery (like your fingers), so tingling or numb hands might happen later. As for the palpitations, I can see that, but if this dude is getting pumped on these hormones, the rate will skyrocket and he could possibly get a heart attack.
However, other things can exacerbate the effects/half life of epinephrine. For example, if you want to know some of the nitty-gritty, epinephrine stimulates what's called a messenger cascade--it binds to a protein on a cell and "turns it on." This turned on protein generates a lot of signalers, typically one called "cyclic AMP" (or cAMP), which is similar to ATP. There are molecules we intake, typically stimulants like caffeine, that inhibit the breakdown of these cAMPS. With more cAMPs, the cell "does more stuff" (possibly synthesize more epinephrine, but I'm not sure.
As per diagnosing this condition, I think that p-word cancer is your best bet--I cant think of any others. But, the tests to confirm this wouldn't be urine based alone I'd imagine. They would start with urine, of course, and would probably consist of a catecholamine test:
http://www.nlm.nih.gov/medlineplus/ency/article/003613.htm
^Here's some info on that diagnostic.
If the doctor suspected cancer, that would most likely lead to adrenal biopsies, which would of course turn up negative since the plot is causing these hormone levels to rise, not a tumorous growth.
I'd imagine the doctor would try to rule out other conditions, or conduct the biopsy as non invasively as possible--possibly through a laprascope (if I spelt that right).
Remember, the body's biochemical pathways are anything by isolated--affect one and you change them all. The body could ramp up cortisol production, too, since it is experiencing what it interprets as stress for long term. Cortisol is the long term stress hormone, not the "ephrines" as I call them (at least not to the same extent, oh, biology and your well of exceptional cases).
Well, that might have been too long-winded, but I hope it helped you out just a little. Remember, I'm no MD, so anyone is free to counter me on this. I'm just going off what I remembered in my biology classes.
Happy writing!