The feeling when you know you need to power through and just do something isn't frustration. Cleaning a dirty toilet isn't frustrating - it's unpleasant and unrewarding work that just needs to be done, but there is no feeling that it is substantially harder than it has to be. You may feel frustrated during the time period in which you are powering through a task, but that's almost always because you are frustrated that you are in a situation where you have to power through a task that probably could have been avoided, the task itself isn't frustrating.