Garth Brooks is stressed to the max as he denies sordid rape claims by a former aide — and sources claim the country king is looking bloated as his blood pressure soars, leaving friends fearing for his life. “He’s totally convinced he’ll get through this mess, but it’s caused him undue stress,” spilled an insider. “He’s in legal meetings and the phone is going off 24/7. He’s having to fend off questions from friends and loved ones.” Added another source close to the country crooner: “It’s perhaps the most traumatic event of his life. The pressure he’s facing is enough to make him a nervous wre…