If I heard him correctly he made the statement that he was struggling today. He later said that people were talking in his ear and he could not hear what they were saying so it may have been a hearing problem.
Yes, I think we should employ Occam’s razor.
Rush is simply not feeling well. Has he been trying new treatment?
You can’t control when you might get a wave of a nausea from medication.
It’s tiring talking for a long time even when one is feeling decently.
He could be having allergy problems on top of everything and just can’t take medication for them right now because they would interact with other things.
He didn’t feel as if he could be the cheerleader we need right now because of how he is feeling physically and thought sounding sick would come across as sounding as if he is depressed about Trump’s chances so he thought he’d just better exit the airwaves for today.