"disconcerting revelation" is a correct and usable phrase in written English.
You could use it to refer to a startling discovery that causes emotional distress or unease. For example: "The detective was shocked to make a disconcerting revelation about the suspect's alibi."
Indeed, just when you think you're ready to move past the steady drumbeat of disconcerting revelations, something else crops up to test your faith.
Gotcha, the noun, has now been entered in the latest printing of Merriam-Webster's 10th Collegiate Dictionary, defined as "an unexpected, usually disconcerting challenge, revelation or catch," its etymology "an alteration of 'got you".' I would add that the original verb phrase carried a second sense, "understood," as in the exchange: "Capish?" "I gotcha".
As disconcerting as the revelation may be, this is hardly the first time the United Nations has been the stage for a bit of international espionage.
The justice minister, Sabine Leutheusser-Schnarrenberger, in a guest editorial for the Web site Spiegel Online, called the revelations about the U.S. surveillance "deeply disconcerting" and possibly "dangerous".
At first glance his movie, which follows the slow, menacing upriver journey of a recently freed murderer, has little in common with Ms. Martel's -- one is urban, the other rural, one thick with relationships, the other haunted by solitude -- but they share a willingness both to test the audience's patience and to reward it with revelations that are both beautiful and disconcerting.
The two "curses" that Hugh discovers -- and that suspend the reader over a long promise of climactic revelation -- range, when finally disclosed, from mildly disconcerting to genuinely upsetting.
Boyd and Schiff both drew upon these letters for their biographies, so they contain few surprises, except for the revelation a disconcerting one, for a lover of Nabokov's fiction that he could be a bore.
The revelation that the UK secretly supported the candidacy of Saudi Arabia for a place on the United Nations Human Rights Councill is a fascinating - if disconcerting - peek behind the diplomatic curtain.
