Nick Cannon is NOT as “EN”credible as he thought — he landed in the hospital on Wednesday after “grinding” on job after job after job. Cannon posted a pic of himself in a hospital bed, hooked up to a bunch of monitors. He wasn’t specific about what was ailing him … but hinted it was somehow related to exhaustion. The “America’s Got Talent” host said, “I really think I’m a superhero” … and compared himself to Batman. Nick’s last hospital scare … was in 2012 for kidney failure.