Randy Houser has a simple explanation for why he postponed a show in Utah a couple of weeks back (Feb. 20): the guy was spent.

"I was in four time zones within like four days, and I had been on the road," he tells ABC News Radio. "Your body can only handle so much. That's all it was to it. I got exhausted, and basically just, and I hadn't really told anybody this, but I got short of breath, and just felt like I couldn't catch my breath," he said.

"We just went to the emergency room just to make sure everything was OK. I wasn't dying, or I wasn't even ill. I was just exhausted. My body was tired."

The doctor's prescription, according to Randy: "I want you to park it for a day, and I want you to take two of these. Don't worry about calling me, take two of these and pass out."

Randy hasn't missed a show since, and he's set to return to Ogden, Utah, on April 3.