Still trying to figure this one out, quite frankly. I've spent a lot of time on the road this fall, and I've been home for a little over a week now. I've been ever-so-slightly under the weather since September. With as much flying as I do, I am often keeping weird hours (due to the need to get to the airport at the ass-crack of dawn, very often), so sleep is a real issue. I guess I'm sensitive when it comes to that, because the wrong bed/pillows in a hotel, being too close to the lobby/elevators, etc. can ruin your sleep, especially when you really need it the most. Sometimes I have trouble sleeping because I don't want to be late to the airport and possibly miss my flight.
So, that's one thing...
The other thing is eating healthy on the road. Also very difficult. It's too easy to get to fast food, for one thing. It can be difficult to find good food, much less something that is remotely healthy. Try eating breakfast at the hotel breakfast area. They're often the same wherever you go, and rarely good (or healthy). Now, I'm no health-food freak -- honestly! I love what would be considered "really bad food". But you just can't do that too often. It takes a concerted effort to avoid it. And then, there's the expense of eating properly. Quality food ain't cheap, and my per diem only goes so far. And don't get me started on airport food - mediocre eats at 4 times the price!
And then there are the germs...
They're everywhere! The uber to the airport? You don't know who/what was in that car before you. Commercial flights? Gross. After-show meet n' greets? Shaking hands with all sorts of nice people who didn't wash their hands after using the restroom? Hey, they're out there! You try not to use your right hand for anything until you can wash it off after, but that's difficult to do sometimes.
When I first got into "the music biz", I wondered why many of the folks I'd met/worked with prefer to hug you hello. Maybe the "gross right hand" phenomenon is the reason why! I wasn't much of a casual hugger before, but I am now!!!
...and I still can't stay healthy.