Emergency Health Scare For Idol Favorite David Cook

"American Idol" contestant David Cook was rushed to the hospital last night after experiencing heart palpitations and high blood pressure.

Released a few hours later, the white rocker's condition was still not resolved.

As first reported by TMZ, Cook was not feeling well during the day and his condition worsened after his performance. Cook was examined by show medics who determined his blood pressure was "far too high." Cook was urged to leave but wanted to wait it out.

An "A.I." exec tells us Cook has been completely stressed out because his brother, who has been sick with cancer, had a setback within the last week. Earlier in the season, just before a performance, David collapsed and said he could not go on -- though he pulled it together at the last minute.

Folks Who Get It: White Rocker David Cook Tears Up Jackson's Billie Jean On American Idol

Though Chris Cornell was acknowledged to be the source of David Cook's "Billie Jean" rearrangement on last week's American Idol, another band has come out demanding Cook (pictured) credit their cover of "Eleanor Rigby."

Doxology, a rock-soul group out of Seattle (who happen to be pals with last season's runner-up Blake Lewis), claim that on March 11 Cook performed their version of the Beatles' classic — which has been available on the band's myspace page and iTunes since January 2007 — without crediting them.

In a statement issued to the press on Saturday, lead vocalist Luke McPherson contends, "When given the opportunity to speak up and reveal where the arrangement came from, David Cook did not. His silence on the issue implies that the arrangement is his own. It is not." The band is careful to note that they are fans of the show and they are not seeking royalties (which they would have earned off of iTunes sales had their name been mentioned on air). Their impetus: "We just want David Cook and American Idol to do the right thing and acknowledge these facts. It's that simple." Whether Cook was actually aware of their version is still unclear as representatives for Fox could not be reached for comment over the weekend.