Long story short, IBS flareups can drain me and affect me to not want to do as much as I could. Longer story short, those (especially with mental-illness flareups and draining-enough Cerebral Palsy) make breathing hard on some days (like today), which can be draining.
Consider this, after all: when your colon presses against your diaphragm and presses your diaphragm onto your lungs, your lungs can't fill up as well and are in a perpetually-somewhat-exhaling state. It's—as far as I know—a little-known symptom that's actually—as I had to Google—frustrated other IBS users.
Try having been prematurely born as well (and having a father whom didn't quit smoking until you were about six years old) and probably being a carrier for long-dormant Tuberculosis—since at least some of your ancestors had it (and at least one died of it)—as well as having ancestors whom had Miner's Lung and other lung-affecting issues (such as addictions to cigarettes and alcohol) and your lungs can really be, so to speak and forgive the language, *****ed up on some days.
In fact, I'm having IBS-related breathing issues as I'm typing—and that's why I mentioned that IBS flareups can make breathing hard on some day's, and thus draining in of itself.
PS If you suffer IBS (and/or any of the other health-related issues that I've mentioned here) and/or have loved ones and/or coworkers whom suffer from IBS (and/or any of the other health-related issues that I've mentioned here) , you might be able to relate to this and get a better sense of what you and/or those in your life suffer. You thus might, for example, be able to at least somewhat understand why even you and/or someone else in your life may seem like a distant and uncaring jerk on some days—not being able to breathe, and thus not being able to have as much as energy to do all that you could do, makes being able to express that you care for others hard.
Also PS: I was thinking about the Amtrak accident in Tacoma and wanted to tweet "#Pray for Washington", and I've been wanting to tweet "#Pray for Reilly, since she has another ear infection"—and wanting to tweet those things are just among the many things that I've wanted to do and that I still have to do.