You can read about author Toni Bernhard's experience with chronic illness here.
....I suggest that you head over to the Psychology Today blog written by Toni Bernhard, J.D. Her recent post entitled "What It's Like to Take a Vacation While Chronically Ill found here is a good example of how energy-sapping illnesses changes the travel experience.
....Am I sorry I went? No. I freely agreed to go. I’m writing this piece to share what it can be like for a sick person to travel. Thankfully, it’s not this difficult for everyone who is chronically ill (which includes those who are in chronic pain).
Nevertheless, I thought my experience might be helpful to others, both to those who are chronically ill and to their family and friends. Continue reading here.