Noun: the amalgamation of "stress" and "session";
A period of time spent stressing about a subject, task, event or occurance, usually ended by a revelation about the subject, task, event or occurance which means you needed not stress as much.
Dude, I totally forgot about that assignment I had to do. Had a stression in my room until I remembered we don't have Jenkins till Wednesday!
Friend 1: I think I knocked up my girlfriend...
Friend 2: Hmmmm, perhaps a stression is in order?