Constiplation
con·sti·pla·tion \ˌkän(t)-stə-ˈplā-shən, 1 : To spend a vast amount of time thinking about whether or not you need or can poop.
Dude, I ate a dicey burrito this morning for breakfast, and I've wasted the entire last hour tied up in constiplation, I really don't want it to hit me during the meeting.

poopworryholicconstipatecontemplateupsettivity