"It's like medicine — and obviously I need that now," the 37-year-old country singer tells Life magazine in an upcoming issue.
His new album, "The Road and the Radio" (search), is set for release Nov. 8.
Zellweger filed for an annulment from Chesney last month. The couple married in a surprise Caribbean island ceremony in May after first meeting in January.
Chesney tells the magazine he has learned that he needs to be more patient. "'I need it all and I need it now' was my mentality before. I used to rush everything to get it done."
"What was that old song? 'We got married in a fever, hotter than a pepper sprout,'" Chesney replies.